Physics · Electromagnetic Induction

A cylindrical bar magnet is rotated about its own longitudinal axis. A stationary wire is connected from the axis and is made to touch the cylindrical surface of the magnet through a sliding contact, closing a circuit containing an ammeter. In this arrangement:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1A direct current flows through the ammeter.
2No current flows through the ammeter.✓
3An alternating sinusoidal current flows through the ammeter.
4A time-varying non-sinusoidal current flows through the ammeter.

Correct answer

No current flows through the ammeter.

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A cylindrical bar magnet is rotated about its own longitudinal axis. A stationary wire is connected from the axis and is made to touch the cylindrical surface of the magnet through a sliding contact, closing a circuit containing an ammeter. In this arrangement:

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A cylindrical bar magnet is rotated about its own longitudinal axis. A stationary wire is connected from the axis and is made to touch the cylindrical surface of the magnet through a sliding contact, closing a circuit containing an ammeter. In this arrangement:

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