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.

I. Because of current in $C_{2}$, it acts as bar magnet.
II. The steady current in the coil $C_{2}$ produces a steady magnetic field.
III. If coil $C_{2}$ is moved towards the coil $C_{1}$, the galvanometer shows a deflection.
IV. This indicates that electric current is induced in coil $C_{1}$. Which of the above statements are correct?
Choose the correct option.

• A. I, II and III
• B. II, III and IV
• C. I, III and IV
• D. All of these

Answer 1

Answer: (D)

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.