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  • 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.

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 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.

Answers (1)

The correct answer is option b

Explanation:-

By rotating the cylindrical magnet, an alternating current (AC) is induced in the wire. When the cylindrical bar magnet is rotated about its axis,then there is no change in flux linked with the circuit. So no current flows through the ammeter A

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infoexpert21

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