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A nonconducting of radius `r` has charge `Q`. A magnetic field perpendicular to the plane of ring changes at the rate `(dB)/(dt)`. The torque experien

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A nonconducting of radius `r` has charge `Q`. A magnetic field perpendicular to the plane of ring changes at the rate `(dB)/(dt)`. The torque experienced by the ring is
A. zero
B. `Qr^(2)(dB)/(dt)`
C. `1/2 Qr^(2)(dB)/(dt)`
D. `pir^(2)Q(dB)/(dt)`
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Correct Answer - C
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