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Magnetic Field Due to a Circular Ring on the Axis

The magnetic ...

Question

The magnetic field around a current-carrying coil lasts.

A

For three hours

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B

As long as current flows thorugh it

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C

Till its half-life period

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D

Field is permanent

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Solution

The correct option is B As long as current flows thorugh it
Magnetic field around a current carrying coil is temporary magnet due to electromagnetism.
Thus it exist only as long as current flows through it

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Magnetic Field Due to a Circular Ring on the Axis

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