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Class XII

PHYSICS

Chapter-6-Electro Magnetic Induction

WORKSHEET-1

1. A coil having 500 sq. loops of side 10 cm is placed normal to magnetic flux which increases at a
rate of 1 T/s. The induced emf is
(a) 0.1 V
(b) 0.5 V
(c) 1 V
(d) 5 V
2. Lenz’s law of electromagnetic induction is as per law of conservation of
(a) energy.
(b) momentum angular.
(c) charge.
(d) electromotive force.
3. The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short
galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle
of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was
observed when the magnet was
(a) moving towards the solenoid
(b) moving into the solenoid
(c) at rest inside the solenoid
(d) moving out of the solenoid
4. The magnetic flux linked with a coil of N turns of area of cross section A held with its plane parallel
to the field B is

5. Faraday’s laws are consequence of the conservation of
(a) charge
(b) energy
(c) magnetic field
(d) both (b) and (c)
6. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are
brought nearer. The current in
(a) P increases while in Q decreases
(b) Q increases while in P decreases
(c) both P and Q increases
(d) both P and Q decreases
7. Direction of current induced in a wire moving in a magnetic field is found using
(a) Fleming’s left hand rule
(b) Fleming’s right hand rule
(c) Ampere’s rule
(d) Right hand clasp rule
8. Lenz’s law is a consequence of the law of conservation of
(a) charge
(b) energy
(c) induced emf
(d) induced current
9. In the given figure current from A to B in the straight wire is decreasing. The direction of induced
current in the loop is A