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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=0
n= number of turns
A= Area
R= Resistance
B= Applied magnetic field
Further 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=nπ
n=1,2,.....
Q=0

652976_223618_ans_10840da3b2a040eab2749a8c73357167.png

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