Question

When the North pole of a bar magnet is pushed towards the coil, the pointer in the galvanometer deflects. Fig. (i) show that it is the relative motion between the magnet and coil that is responsible for generation of electric current in the coil. In Fig. (ii), the bar magnet is replaced by a second coil $C_2$ connected to a battery. The steady current in the coil $C_2$ produces a steady magnet field.
As coil $C_2$ is moved toward the coil $C_1$, the galvanometer shows a deflection. Again, it is the relative motion between the coils that induces the electric current.

The change in magnetic flux

• A. decreases the radius of the coil $C_1$ to half the initial radius
• B. induces emf in the coil $C_1$
• C. increases the radius of coil $C_1$ to double the initial radius
• D. None of the above

Answer 1

Answer: (B)

Correct answer is (b) induces emf in the coil $C_1$