Question

A cylindrical bar magnet is rotated about its axis as shown in figure. A wire is connected from the axis and is made to touch Bar the cylindrical surface through a ma8net contact. Then

• A. A direct current flows in the ammeter A.
• B. No current flows through the ammeter A.
• C. An alternating sinusoidal current flows through the ammeter A with a time period, T = $\frac{2\pi}{\omega}$
• D. A time varying non-sinusoidal current flows through the ammeter A.

Answer 1

Answer: (B)

No current flows through the ammeter A.

Answer 2

As there is no change in magnetic flux associated with the circuit no current is induced in the circuit the ammeter A shows no deflection.