12th Class Physics Magnetism Question Bank

done Assertion And Reason (MCQs) - Moving Charges and Magnetism Total Questions - 26

• question_answer1)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic field lines always form closed loops.

  Reason (R): Moving charges or currents produce a magnetic field.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer2)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.

  Reason (R): Force is inversely proportional to the magnetic field applied.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer3)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic field interacts with a moving charge and not with a stationary charge.

  Reason (R): A moving charge produces a magnetic field.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer4)
  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: Assertion [A]: An electron and proton enters a magnetic field with equal velocities, then, the force experienced by proton will be more than electron. Reason (R): The mass of proton is 1999 times more than the mass of electron.
  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer5)
  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: Assertion [A]: Magnetic lines of force form continuous closed loops. Reason (R: Magnetic poles always occur in pairs as north pole and south pole.
  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer6)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: If a charged particle is moving on a circular path in a perpendicular magnetic field, the momentum of the particle is not changing.

  Reason (R): Velocity of the particle in not changing in the magnetic field.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer7)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When force is zero, the charged particle follows linear path.

  Reason (R): A charged particle enters in a uniform magnetic field, whose velocity makes an angle \[\theta \] with magneticd field will cover a linear path.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer8)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When a charged particle moves perpendicular to magnetic field then its kinetic energy and momentum gets affected.

  Reason (R): Force changes velocity of charged particle.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer9)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The energy of charged particle moving in a uniform magnetic field does not change.

  Reason (R): Work done by magnetic field on the charge is zero.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer10)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The kinetic energy of a charged particle moving in a uniform magnetic field does not change.

  Reason (R): In a uniform magnetic field no force acts on the charge particle.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer11)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When the observation point lies along the length of the current element, magnetic field is zero.

  Reason (R): Magnetic field close to current element is zero.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer12)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: A direct current flows through a metallic rod, produce magnetic field only outside the rod.

  Reason (R): There is no flow of charge carriers inside the rod.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer13)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The magnetic field intensity at the centre of a circular coil carrying current changes, if the current through the coil is doubled.

  Reason (R): The magnetic field intensity is dependent on current in conductor.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer14)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: A circular loop carrying current lies in XY plane with its center at origin having a magnetic flux in negative Z-axis.

  Reason (R): Magnetic flux direction is independent of the direction of current in the conductor.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer15)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Ampere's circuital law holds for steady currents which do not fluctuate with time.

  Reason (R): Ampere's circuital Law is similar to that of Biot-savart's law.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer16)
                            

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: A current / flows along the Length of an infinitely long straight and thin walled pipe. Then the magnetic field at any point inside the pipe is zero.

  Reason (R): \[\oint{\overrightarrow{B}.d}\,\overrightarrow{l}={{\mu }_{0}}l\]

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer17)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic field due to current carrying solenoid is independent of its length and cross-sectional area.

  Reason (R): The magnetic field inside the solenoid is uniform.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer18)
      

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid.

  Reason (R): The magnetic field inside the solenoid is uniform.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer19)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The magnetic field at the ends of a very long current carrying solenoid is half of that at the centre.

  Reason (R): If the solenoid is sufficiently long, the field within it is uniform.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer20)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: If two Long wires, hanging freely are connected to a battery in series, they come closer to each other.

  Reason (R): Force of attraction acts between the two wires carrying current.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer21)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When current is represented by a straight line, the magnetic field will be circular.

  Reason (R): According to Fleming's left hand rule, direction of force is parallel to the magnetic field.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer22)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Two parallel conducting wires carrying currents in opposite direction, come close to each other.

  Reason (R): Parallel currents repel and anti-parallel currents attract.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer23)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When two long parallel wires, hanging freely are connected in parallel to a battery, they come closer to each other.

  Reason (R): Wires carrying current in opposite direction repel each other.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer24)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Torque on the coil is the maximum, when coil is suspended in a radial magnetic field.

  Reason (R): The torque tends to rotate the coil on its own axis.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer25)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic moment is measured in joule/tesla or amp \[{{m}^{2}}\].

  Reason (R): Joule/tesla is equivalent to amp \[{{m}^{2}}\].

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer26)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The net magnetic force on a current carrying loop in a uniform magnetic field is zero but torque may or may not be zero.

  Reason (R): Torque on a current carrying coil in a magnetic field is given by \[\overrightarrow{\tau }=nl(\overrightarrow{A}\times \overrightarrow{B})\].

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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