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Question

# A flat coil, C of n turn, area A and resistance R, is placed in a uniform magnetic field of magnitude B. The plane of the coil is initially perpendicular to B. The coil is rotated by an angle θ about a diameter and charge of amount Q flows through it. The plane of the coil is initially kept parallel to B. The coil is rotated by an angle θ about the diameter perpendicular to B and charge of amount Q flows through it.Choose the correct alternatives

A
θ=90o,Q=(Ban/R)
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B
θ=180o,Q=(2Ban/R)
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C
θ=180o,Q=0
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D
θ=360o,Q=0
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E
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Solution

## The correct options are A θ=90o,Q=(Ban/R) C θ=180o,Q=0 D θ=360o,Q=0n= number of turnsA= AreaR= Resistance B= Applied magnetic fieldFurther changing electric field produces magnetic field & changing magnetic field produces electric field for given condition, that the rotation of the coil is perpendicular thus when such rotations is along angles which are integral multiple of π , charge Q is zero.i.e Q=nπn=1,2,.....Q=0

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