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A metallic ring of radius a and resistance R is held fixed with its axis along a spatially uniform magnetic field whose magnitude is Ba sin(ωt). Neglect gravity. Then, 

(A) the current in the ring oscillates with a frequency of 2ω. 

(B) the Joule healing loss in the ring is proportional to a2

(C) the force per unit length on the ring will be proportional to B02

(D) the net force on the ring is non-zero.

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The correct option is (C) the force per unit length on the ring will be proportional to B0.

Explanation:

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