question_answer2)
How is the direction of magnetic field at a point
determined?
question_answer4)
State the direction of magnetic field in the following
case
question_answer10)
How do you locate a current-carrying wire concealed in a
wall?
question_answer11)
Why do we apply clock-rule?
question_answer12)
Soft iron is not used for making a permanent magnet. Why?
question_answer13)
What type of dynamo is used in a bicycle ?
question_answer14)
How is AC different from DC?
question_answer15)
What should be done in case a person comes in contact with
a live wire?
question_answer16)
What does the degree of closeness of magnetic field lines
near the poles signify?
question_answer17)
At what place of the magnet are the magnetic field lines
denser?
question_answer19)
Write one application of magnetic field of current-carrying
solenoid?
question_answer20)
What do you understand by the current rating
of an electric fuse?
question_answer22)
How is induced current in a secondary coil related to
current in a primary Coil?
question_answer23)
Identify the poles of a magnet in the figure.
question_answer27)
Which rule is used to find North-South polarities of an
electromagnet?
question_answer30)
What type of generator is used at power stations?
question_answer32)
In a household circuits, is a fuse wire connected in
series or in parallel?
question_answer40)
Define magnetic field. Give two properties of field lines
of a bar magnet.
question_answer45)
What is an electromagnet? On what principle is it based?
question_answer47)
Describe Faraday's experiment on electromagnetic
induction.
question_answer49)
Represent AC and DC graphically.
question_answer51)
Draw magnetic field lines of a current- carrying circular
loop.
question_answer57)
No two magnetic field lines can intersect each other.
Explain.
question_answer65)
What is a commutator? How does it bring direct current?
question_answer66)
Name a safety device commonly used in electric circuits.
Explain its working.
question_answer67)
Distinguish between a permanent magnet and an
electromagnet.
question_answer91)
Explain the components of domestic circuit.
question_answer93)
What is magnetic
effect of electric current?
question_answer95)
[NCERT]
Name some sources
of direct current.
question_answer96)
[NCERT]
Which sources
produce alternating current?
question_answer99)
Name some devices
in which electric motors are used. [NCERT]
question_answer100)
What happens if a
current carrying conductor is placed in the magnetic field?
question_answer102)
Name the alloy
which is mainly used for making permanent magnets.
question_answer103)
Why is
electromagnetic induction so called?
question_answer104)
Name an instrument
in which the directive property of a magnet is used.
question_answer105)
What is a
solenoid? [CBSE Delhi2008]
question_answer106)
Which effect of
electric current is utilized in the working of an electric fuse?
question_answer107)
What is the
frequency of A.C. (alternating current) in India?
question_answer108)
What will you do if
you see a person coming in contact with a live wire?
question_answer111)
How is the fuse
connected in an electric circuit?
question_answer112)
Why is a fuse
usually made of tin or tin-copper alloy?
question_answer113)
What is the
capacity of a fuse commonly used in domestic electrical fittings?
question_answer115)
On which effect of
electricity does fuse work?
question_answer118)
State Faraday's law
of electromagnetic induction.
question_answer119)
The frequency of
alternating current in India is 50 Hz. What does it mean?
question_answer121)
What does the
closeness of field lines in a magnetic field signify?
question_answer124)
Identify the poles
of the magnet in the figure (a) and (b) shown below.
question_answer125)
List the properties
of magnetic field lines.
question_answer128)
Why two magnetic
lines of force never intersect each other? [NCERT]
question_answer131)
Explain different
ways to induce electric current in a given coil. [NCERT]
question_answer134)
List three sources
of magnetic fields. [NCER T]
question_answer138)
When does an
electric short circuit occur?
[NCERT]
question_answer142)
What is electromagnetic
induction?
question_answer143)
How can the
magnitude of the induced current be increased?
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(a) What is the polarity of end P?
(b) What is the polarity of end O?
Given 
What would be the effect of
(a) moving the wire at a higher speed?
(b) moving the wire upwards rather than downwards?
(c) using a stronger magnet?
(d) holding the wire still in the magnetic field?
(b) Which is the North pole, X or Y?
What is the direction of induced current produced in the
loop, if any, when the current flowing in the straight wire
(a) is steady, i.e., does not vary.
(b) is increasing in magnitude.
Justify your answer in each case.
