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Class XII

PHYSICS

Chapter-6-Electro Magnetic Induction

WORKSHEET-3

1. The property of coil by which a counter e.m.f. is induced in it when the current through
the coil changes is known as

A. Self-inductance

B. Mutual inductance

C. Series aiding inductance

D. Capacitance

2. Which circuit element(s) will oppose the change in circuit current?

A. Resistance only

B. Inductance only

C. Capacitance only

D. Inductance and capacitance

3. In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling
will be

A. 2.0

B. 1.0

C. 0.5

D. Zero

4. Two coils are placed closed to each other. The mutual inductance of the pair of coils depends
upon
(a) the rate at which currents are changing in the two coils.
(b) relative position and orientation of two coils.
(c) the material of the wires of the coils.
(d) the currents in the two coils.
5. When current in a coil changes from 5 A to 2 A in 0.1 s, average voltage of 50 V is produced. The
self-inductance of the coil is
(a) 1.67 H
(b) 6 H