A cylindrical bar magnet is rotated about its axis.

Question:

A cylindrical bar magnet is rotated about its axis. A wire is connected from the axis and is made to touch the cylindrical surface through a 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=2π/ω.

(d) a time-varying non-sinusoidal current flows through the ammeter A.

Solution:

(b) no current flows through the ammeter A.

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