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 .
(b) no current flows through the ammeter .
(c) an alternating sinusoidal current flows through the ammeter with a time period .
(d) a time varying non-sinusoidal current flows through the ammeter .
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