Question

The steady current in the coil $C_2$ produces a steady magnetic field. As coil $C_2$ is moved towards the coil $C_1$, the galvanometer shows a deflection. This indicates that electric current is induced in coil $C_1$.
When $C_2$ is moved away, the galvanometer shows a deflection again, but this time in the opposite direction.

What will be the direction of deflection of galvanometer, when $C_2$ is moved away?

• A. Same direction
• B. Opposite direction
• C. No deflection
• D. Neither (a) nor (b)

Answer 1

Answer: (B)

The steady current in the coil $C_2$ produces a steady magnetic field. As coil $C_2$ is moved towards the coil $C_1$, the galvanometer shows a deflection. This indicates that electric current is induced in coil $C_1$. When $C_2$ is moved away, the galvanometer shows a deflection again, but this time in the opposite direction. The deflection lasts as long as coil $C_2$ is in motion. When the coil $C_2$ is held fixed and $C_1$ is moved, the same effects are observed. It is the relative motion between the coils that induces the electric current.