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Q.

A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each.

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a

half revolution   

b

two revolutions

c

one revolution

d

one-fourth revolution

answer is A.

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Detailed Solution

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When a rectangular coil is rotated in a magnetic field, the direction of the induced current changes once in the half revolution. As a result, the direction of the current in the coil remains the same.

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A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each.