JEE Main & Advanced Physics Magnetism Question Bank

done Earth's Magnetism Total Questions - 59

• question_answer1)
  A very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained 20 cm away from the centre of the magnet. If the earth's magnetic field (horizontal component) at this point be 0.3 gauss, the magnetic moment of the magnet is [CPMT 1987; MNR 1978]
  A)
             \[8.0\times {{10}^{2}}e.m.u.\]                                          done clear
  B)
             \[1.2\times {{10}^{3}}e.m.u.\] done clear
  C)
             \[2.4\times {{10}^{3}}e.m.u.\]                                          done clear
  D)
             \[3.6\times {{10}^{3}}e.m.u.\] done clear
  View Solution play_arrow

• question_answer2)
  Intensity of magnetic field due to earth at a point inside a hollow steel box is                                      [MP PET 1995]
  A)
             Less than outside                done clear
  B)
             More than outside done clear
  C)
             Same                                        done clear
  D)
             Zero done clear
  View Solution play_arrow

• question_answer3)
  Earth's magnetic field always has a horizontal component except at or Horizontal component of earth's magnetic field remains zero at                                                  [CPMT 1971, 81, 83]
  A)
             Equator                                   done clear
  B)
             Magnetic poles done clear
  C)
             A latitude of 60o                   done clear
  D)
             An altitude of 60o done clear
  View Solution play_arrow

• question_answer4)
  A dip needle in a plane perpendicular to magnetic meridian will remain [NCERT 1975; MP PMT 1984; MP PET 1995]
  A)
             Vertical done clear
  B)
             Horizontal done clear
  C)
             In any direction done clear
  D)
             At an angle of dip to the horizontal done clear
  View Solution play_arrow

• question_answer5)
  At magnetic poles of earth, angle of dip is [CPMT 1977, 91; NCERT 1981; MP PET 1997; Pb PET 2002]
  A)
             Zero                                          done clear
  B)
             45o   done clear
  C)
             90o done clear
  D)
             180o done clear
  View Solution play_arrow

• question_answer6)
  The correct relation is [CPMT 1986; MP PET 1981; AFMC 1996]
  A)
             \[B=\frac{{{B}_{V}}}{{{B}_{H}}}\]                                     done clear
  B)
             \[B={{B}_{V}}\times {{B}_{H}}\] done clear
  C)
             \[|B|=\sqrt{B_{H}^{2}+B_{V}^{2}}\]                             done clear
  D)
             \[B={{B}_{H}}+{{B}_{V}}\] (Where \[{{B}_{H}}=\]Horizontal component of earth's magnetic field; \[{{B}_{V}}\]= Vertical component of earth's magnetic field and B  = Total intensity of earth's magnetic field) done clear
  View Solution play_arrow

• question_answer7)
  At a certain place, the horizontal component of earth's magnetic field is \[\sqrt{3}\]times the vertical component. The angle of dip at that place is         [MP PMT 1984, 85; AFMC 2000]
  A)
             \[60{}^\circ \]                       done clear
  B)
             \[45{}^\circ \] done clear
  C)
             \[90{}^\circ \]                       done clear
  D)
             \[\begin{align}   & 2rH \\  & {{\mu }_{0}}N \\ \end{align}\] done clear
  View Solution play_arrow

• question_answer8)
  The vertical component of earth's magnetic field is zero at or The earth's magnetic field always has a vertical component except at the [NCERT 1980, 88; CPMT 1983; MP PMT 1996]
  A)
             Magnetic poles                    done clear
  B)
             Geographical poles done clear
  C)
             Every place                            done clear
  D)
             Magnetic equator done clear
  View Solution play_arrow

• question_answer9)
  The angle between the magnetic meridian and geographical meridian is called  [MNR 1990; UPSEAT 1999, 2000; MP PMT 2000]
  A)
             Angle of dip                           done clear
  B)
             Angle of declination done clear
  C)
             Magnetic moment             done clear
  D)
             Power of magnetic field done clear
  View Solution play_arrow

• question_answer10)
  The lines of forces due to earth's horizontal component of magnetic field are [CPMT 1985; MP PMT 1980; AIIMS 1998]
  A)
             Parallel straight lines          done clear
  B)
             Concentric circles done clear
  C)
             Elliptical                                   done clear
  D)
             Parabolic done clear
  View Solution play_arrow

• question_answer11)
  At a place, if the earth's horizontal and vertical components of magnetic fields are equal, then the angle of dip will be  [SCRA 1994; DCE 2001; MP PMT 2002]
  A)
             \[30{}^\circ \]                       done clear
  B)
             \[90{}^\circ \] done clear
  C)
             \[45{}^\circ \]                       done clear
  D)
             0° done clear
  View Solution play_arrow

• question_answer12)
  If the angles of dip at two places are 30o and 45o respectively, then the ratio of horizontal  components of earth's magnetic field at the two places will be                                                                  [MP PET 1989]
  A)
             \[\sqrt{3}:\sqrt{2}\]           done clear
  B)
             \[1:\sqrt{2}\] done clear
  C)
             \[1:\sqrt{3}\]                        done clear
  D)
             \[1:2\] done clear
  View Solution play_arrow

• question_answer13)
  At a place the earth's horizontal component of magnetic field is \[0.36\times {{10}^{-4}}weber/{{m}^{2}}\]. If the angle of dip at that place is 60o, then the vertical component of earth's field at that place in weber/m2 will be approximately                    [MP PMT 1985]
  A)
             \[0.12\times {{10}^{-4}}\]       done clear
  B)
             \[0.24\times {{10}^{-4}}\] done clear
  C)
             \[0.40\times {{10}^{-4}}\]       done clear
  D)
             \[0.62\times {{10}^{-4}}\] done clear
  View Solution play_arrow

• question_answer14)
  The angle of dip at a place is 40.6o and the intensity of the vertical component of the earth's magnetic field \[V=6\times {{10}^{-5}}\]Tesla. The total intensity of the earth's magnetic field (I) at this place is                         [MP PMT 1993]
  A)
             \[7\times {{10}^{-5}}tesla\]    done clear
  B)
             \[6\times {{10}^{-5}}tesla\] done clear
  C)
             \[5\times {{10}^{-5}}tesla\]    done clear
  D)
             \[9.2\times {{10}^{-5}}tesla\] done clear
  View Solution play_arrow

• question_answer15)
  The angle of dip is the angle                                     [CPMT 1978]
  A)
                     Between the vertical component of earth's magnetic field and magnetic meridian done clear
  B)
                     Between the vertical component of earth's magnetic field and geographical meridian done clear
  C)
                     Between the earth's magnetic field direction and horizontal direction done clear
  D)
                     Between the magnetic meridian and the geographical meridian done clear
  View Solution play_arrow

• question_answer16)
  At a certain place the angle of dip is 30° and the horizontal component of earth's magnetic field is 0.50 Oersted. The earth's total magnetic field is                                   [CPMT 1990]
  A)
             \[\sqrt{3}\]                            done clear
  B)
             \[1\] done clear
  C)
             \[\frac{1}{\sqrt{3}}\]         done clear
  D)
             \[\frac{1}{2}\] done clear
  View Solution play_arrow

• question_answer17)
  The angle of dip at the magnetic equator is   [MP PET 1984; MP PMT 1987; CBSE PMT 1989, 90; MP Board 1980; CPMT 1977, 87, 90; Manipal MEE 1995]
  A)
             0°    done clear
  B)
             45° done clear
  C)
             30° done clear
  D)
             90° done clear
  View Solution play_arrow

• question_answer18)
  The line on the earth's surface joining the points where the field is horizontal is          [MNR 1985; UPSEAT 1999; Pb PET 2004]
  A)
             Magnetic meridian             done clear
  B)
             Magnetic axis done clear
  C)
             Magnetic line                        done clear
  D)
             Magnetic equator done clear
  E)
  (e)     Isogonic line done clear
  View Solution play_arrow

• question_answer19)
  The angle between the earth's magnetic and the earth's geographical axes is                                     [MNR 1979]
  A)
             Zero                                          done clear
  B)
             17° done clear
  C)
             23° done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer20)
  The lines joining the places of the same horizontal intensity are known as                                            [MNR 1984]
  A)
             Isogonic lines                        done clear
  B)
             Aclinic lines done clear
  C)
             Isoclinic lines                         done clear
  D)
             Agonic lines done clear
  E)
  (e)     Isodynamic lines done clear
  View Solution play_arrow

• question_answer21)
  Ratio between total intensity of magnetic field at equator to poles is                                      [IIT 1970; CPMT 1981]
  A)
             1 : 1                                           done clear
  B)
             1 : 2                                           done clear
  C)
             2 : 1                                           done clear
  D)
             1 : 4 done clear
  View Solution play_arrow

• question_answer22)
  A line passing through places having zero value of magnetic dip is called                                [CPMT 1987]
  A)
             Isoclinic line                           done clear
  B)
             Agonic line done clear
  C)
             Isogonic line                          done clear
  D)
             Aclinic line done clear
  View Solution play_arrow

• question_answer23)
  At a place, the horizontal and vertical intensities of earth's magnetic field is 0.30 Gauss and 0.173 Gauss respectively. The angle of dip at this place is         [MP PMT 1986]
  A)
             30° done clear
  B)
             90° done clear
  C)
             60° done clear
  D)
             45° done clear
  View Solution play_arrow

• question_answer24)
  The angle of dip at a place is 60°. At this place the total intensity of earth's magnetic field is 0.64 units. The horizontal intensity of earth's magnetic field at this place is [MP PET 1984]
  A)
             1.28 units                                done clear
  B)
             0.64 units done clear
  C)
             0.16 units                                done clear
  D)
             0.32 units done clear
  View Solution play_arrow

• question_answer25)
  The magnetic compass is not useful for navigation near the magnetic poles because                       [BIT Ranchi 1982]
  A)
             The magnetic field near the poles is zero done clear
  B)
             The magnetic field near the poles is almost vertical done clear
  C)
             At low temperature, the compass needle looses its magnetic properties done clear
  D)
             Neither of the above done clear
  View Solution play_arrow

• question_answer26)
  The angle of dip at a place on the earth gives [MP PET 1994]
  A)
             The horizontal component of the earth's magnetic field done clear
  B)
             The location of the geographic meridian done clear
  C)
             The vertical component of the earth's field done clear
  D)
             The direction of the earth's magnetic field done clear
  View Solution play_arrow

• question_answer27)
  At the magnetic north pole of the earth, the value of horizontal component of earth's magnetic field and angle of dip are, respectively                                                       [MP PMT 1994]
  A)
             Zero, maximum                   done clear
  B)
             Maximum, minimum done clear
  C)
             Maximum, maximum        done clear
  D)
             Minimum, minimum done clear
  View Solution play_arrow

• question_answer28)
  At a place, the magnitudes of the horizontal component and total intensity of the magnetic field of the earth are 0.3 and 0.6 Oersted respectively. The value of the angle of dip at this place will be                                    [MP PMT 1994]
  A)
             60° done clear
  B)
             45° done clear
  C)
             30° done clear
  D)
             0° done clear
  View Solution play_arrow

• question_answer29)
  A dip circle is at right angle to the magnetic meridian. What will be the apparent dip                         [AFMC 1995]
  A)
             0°    done clear
  B)
             30° done clear
  C)
             60º done clear
  D)
             90° done clear
  View Solution play_arrow

• question_answer30)
  A bar magnet is placed north-south with its north pole due north. The points of zero magnetic field will be in which direction from the centre of the magnet [MNR 1995; MP PMT 1995; UPSEAT 2000]
  A)
             North and south done clear
  B)
             East and west done clear
  C)
             North-east and south-west done clear
  D)
             North-west and south-east done clear
  View Solution play_arrow

• question_answer31)
  In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be                                               [MP PMT 1985]
  A)
             4 : 1                                           done clear
  B)
             1 : 2 done clear
  C)
             2 : 1                                           done clear
  D)
             1 : 8 done clear
  View Solution play_arrow

• question_answer32)
  The magnetic field due to the earth is closely equivalent to that due to                                  [BIT Ranchi 1982]
  A)
             A large magnet of length equal to the diameter of the earth   done clear
  B)
             A magnetic dipole placed at the centre of the earth done clear
  C)
             A large coil carrying current done clear
  D)
             Neither of the above done clear
  View Solution play_arrow

• question_answer33)
  The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is                                                     [MP PMT 1995]
  A)
             \[{{\tan }^{-1}}\frac{3}{4}\]    done clear
  B)
             \[{{\sin }^{-1}}\frac{3}{4}\] done clear
  C)
             \[{{\tan }^{-1}}\frac{4}{3}\]    done clear
  D)
              \[{{\sin }^{-1}}\frac{3}{5}\] done clear
  View Solution play_arrow

• question_answer34)
  The value of the horizontal component of the earth's magnetic field and angle of dip are \[1.8\times {{10}^{-5}}Weber/{{m}^{2}}\] and 30° respectively at some place. The total intensity of earth's magnetic field at that place will be              [MP PET 1996]
  A)
             \[2.08\times {{10}^{-5}}Weber/{{m}^{2}}\]                done clear
  B)
             \[3.67\times {{10}^{-5}}Weber/{{m}^{2}}\] done clear
  C)
             \[3.18\times {{10}^{-5}}Weber/{{m}^{2}}\]                done clear
  D)
             \[5.0\times {{10}^{-5}}Weber/{{m}^{2}}\] done clear
  View Solution play_arrow

• question_answer35)
  When the N-pole of a bar magnet points towards the south and S-pole towards the north, the null points are at the                    [MP PMT 1996]
  A)
             Magnetic axis done clear
  B)
             Magnetic centre done clear
  C)
             Perpendicular divider of magnetic axis done clear
  D)
                  N  and S poles done clear
  View Solution play_arrow

• question_answer36)
  Lines which represent places of constant angle of dip are called
  A)
             Isobaric lines                         done clear
  B)
             Isogonic lines done clear
  C)
             Isoclinic lines                         done clear
  D)
             Isodynamic lines done clear
  View Solution play_arrow

• question_answer37)
  The vertical component of the earth's magnetic field is zero at a place where the angle of dip is                 [MP PMT/PET 1998]
  A)
             0°    done clear
  B)
             45° done clear
  C)
             60° done clear
  D)
             90° done clear
  View Solution play_arrow

• question_answer38)
  At a certain place, the horizontal component \[{{B}_{0}}\] and the vertical component \[{{V}_{0}}\] of the earth's magnetic field are equal in magnitude. The total intensity at the place will be [MP PMT 1999, 2003]
  A)
             \[{{B}_{0}}\]                          done clear
  B)
             \[B_{0}^{2}\] done clear
  C)
             \[2{{B}_{0}}\]                        done clear
  D)
             \[\sqrt{2}{{B}_{0}}\] done clear
  View Solution play_arrow

• question_answer39)
  A compass needle will show which one of the following directions at the earth's magnetic pole [KCET 1993, 94]
  A)
             Vertical                                    done clear
  B)
             No particular direction done clear
  C)
             Bent at 45° to the vertical        done clear
  D)
             Horizontal done clear
  View Solution play_arrow

• question_answer40)
  The north pole of the earth's magnet is near the geographical                                    [KCET 1994]
  A)
             South                                       done clear
  B)
             East                                           done clear
  C)
             West                                        done clear
  D)
             North done clear
  View Solution play_arrow

• question_answer41)
  The magnetic field of earth is due to                  [JIPMER 1997]
  A)
             Motion and distribution of some material in and outside the earth done clear
  B)
             Interaction of cosmic rays with the current of earth done clear
  C)
             A magnetic dipole buried at the centre of the earth done clear
  D)
             Induction effect of the sun done clear
  View Solution play_arrow

• question_answer42)
  A short magnet of moment 6.75 Am2 produces a neutral point on its axis. If horizontal component of earth's magnetic field is \[5\times {{10}^{-5}}Wb/{{m}^{2}}\], then the distance of the neutral point should be                                     [SCRA 1994]
  A)
             10 cm                                       done clear
  B)
             20 cm done clear
  C)
             30 cm                                       done clear
  D)
             40 cm done clear
  View Solution play_arrow

• question_answer43)
  Due to the earth's magnetic field, charged cosmic ray particles                                   [CBSE PMT 1997]
  A)
             Require greater kinetic energy to reach the equator than the poles done clear
  B)
             Require less kinetic energy to reach the equator than the poles done clear
  C)
             Can never reach the equator done clear
  D)
             Can never reach the poles done clear
  View Solution play_arrow

• question_answer44)
  Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth?s magnetic field with magnet having magnetic moment 2M making and angle q with the magnetic meridian such that                                                                          [AFMC 1999]
  A)
             \[\theta ={{\tan }^{-1}}\left( \frac{1}{\sqrt{3}} \right)\]      done clear
  B)
             \[\theta ={{\tan }^{-1}}\left( \sqrt{3} \right)\] done clear
  C)
             \[\theta ={{\tan }^{-1}}\left( \frac{1}{2} \right)\]      done clear
  D)
             \[\theta ={{\tan }^{-1}}\left( \frac{3}{4} \right)\] done clear
  View Solution play_arrow

• question_answer45)
  Angle of dip is 90o at                                                    [AIIMS 1999]
  A)
             Poles                                        done clear
  B)
             Equator done clear
  C)
             Both (a) and (b)                   done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer46)
  At a certain place the horizontal component of the earth?s magnetic field is B0 and the angle of dip is 45o. The total intensity of the field at that place will be  [MP PET 2000; Pb PET 2003]
  A)
             B0   done clear
  B)
             \[\sqrt{2}\,{{B}_{0}}\] done clear
  C)
             2 B0                                           done clear
  D)
             \[B_{0}^{2}\] done clear
  View Solution play_arrow

• question_answer47)
  The value of angle of dip is zero at the magnetic equator because on it                                  [MP PET 2001]
  A)
             V and H are equal done clear
  B)
             The value of V and H is zero done clear
  C)
             The value of V is zero done clear
  D)
             The value of H is zero done clear
  View Solution play_arrow

• question_answer48)
  Which of the following relation is correct in magnetism [KCET (Engg./Med.) 2001]
  A)
             \[{{I}^{2}}={{V}^{2}}+{{H}^{2}}\]                                      done clear
  B)
             \[I=V+H\] done clear
  C)
             \[V={{I}^{2}}+{{H}^{2}}\] done clear
  D)
             \[{{V}^{2}}=I+H\] done clear
  View Solution play_arrow

• question_answer49)
  The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing [AFMC 1999; Pb. PMT 2000; CPMT 2001; MH CET 2003]
  A)
             North                                       done clear
  B)
             South done clear
  C)
             East                                           done clear
  D)
             West done clear
  View Solution play_arrow

• question_answer50)
  Magnetic meridian is a                                          [Orissa JEE 2002]
  A)
             Point                                        done clear
  B)
             Horizontal plane done clear
  C)
             Vertical plane                       done clear
  D)
             Line along N-S done clear
  View Solution play_arrow

• question_answer51)
  The angle of dip at a certain place is 30o. If the horizontal component of the earth?s magnetic field is H, the intensity of the total magnetic field is     [UPSEAT 1993, 2000; MP PMT 2002]
  A)
             \[\frac{H}{2}\]                      done clear
  B)
             \[\frac{2H}{\sqrt{3}}\] done clear
  C)
             \[H\sqrt{2}\]                         done clear
  D)
             \[H\sqrt{3}\] done clear
  View Solution play_arrow

• question_answer52)
  The horizontal component of the earth's magnetic field is 0.22 Gauss and total magnetic field is 0.4 Gauss. The angle of dip. is                                                                        [MP PMT 2004]
  A)
             \[{{\tan }^{-1}}\,(1)\]            done clear
  B)
             \[{{\tan }^{-1\,}}(\infty )\] done clear
  C)
             \[{{\tan }^{-1\,}}(1.518)\]    done clear
  D)
             \[{{\tan }^{-1\,}}(\pi )\] done clear
  View Solution play_arrow

• question_answer53)
  A bar magnet is situated on a table along east-west direction in the magnetic field of earth. The number of neutral points, where the magnetic field is zero, are  [MP PMT 2004]
  A)
             2     done clear
  B)
             0 done clear
  C)
             1     done clear
  D)
             4 done clear
  View Solution play_arrow

• question_answer54)
  At which place, earth's magnetism become horizontal [AFMC 2004]
  A)
             Magnetic pole                           done clear
  B)
             Geographical pole done clear
  C)
             Magnetic meridian                   done clear
  D)
             Magnetic equator done clear
  View Solution play_arrow

• question_answer55)
  Isogonic lines on magnetic map will have           [AFMC 2004]
  A)
             Zero angle of dip done clear
  B)
             Zero angle of declination done clear
  C)
             Same angle of declination done clear
  D)
             Same angle of dip done clear
  View Solution play_arrow

• question_answer56)
  A current carrying coil is placed with its axis perpendicular to N-S direction. Let horizontal component of earth's magnetic field be Ho and magnetic field inside the loop is H. If a magnet is suspended inside the loop, it makes angle \[\theta \] with H. Then \[\theta \]=                                                                       [Orissa PMT 2004]
  A)
             \[{{\tan }^{-1}}\left( \frac{{{H}_{0}}}{H} \right)\]              done clear
  B)
             \[{{\tan }^{-1}}\left( \frac{H}{{{H}_{0}}} \right)\] done clear
  C)
             \[\cos e{{c}^{-1}}\left( \frac{H}{{{H}_{0}}} \right)\]          done clear
  D)
             \[{{\cot }^{-1}}\left( \frac{{{H}_{0}}}{H} \right)\] done clear
  View Solution play_arrow

• question_answer57)
  Let V and H be the vertical and horizontal components of earth's magnetic field at any point on earth. Near the north pole                                                             [UPSEAT 2004]
  A)
             \[V>>H\]                                  done clear
  B)
             \[V<<H\] done clear
  C)
             \[V=H\]                                     done clear
  D)
             \[V=H=0\] done clear
  View Solution play_arrow

• question_answer58)
  At the magnetic poles of the earth, a compass needle will be  [DCE 2003]
  A)
             Vertical done clear
  B)
             Bent slightly done clear
  C)
             Horizontal                                 done clear
  D)
             Inclined at 45o to the horizontal done clear
  View Solution play_arrow

• question_answer59)
  If magnetic lines of force are drawn by keeping magnet vertical, then number of neutral points will be [MP PMT 1985; CPMT 1985]
  A)
             One                                          done clear
  B)
             Two    done clear
  C)
             Four                                          done clear
  D)
             Five done clear
  View Solution play_arrow