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.