Current through Bar Magnet!

A cylindrical bar magnet is rotated about its axis. A wire, which contains a current source (see diagram) 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 \(\large T= \frac{2π}{ω}\).

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

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