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.