Questions
24. A wire of length 2 m is moving at a speed of perpendicular to its length and a homogeneous magnetic field of 0.5 T. The ends of the wire are joined to a circuit of resistance 10 . The rate at which work is being done to keep the wire moving at constant speed is
detailed solution
Correct option is B
Rate of work =Wt=P=Fv; also F=Bil=B BvlR l⇒P=B2v2l2R=(0.5)2×(5)2×(2)210=52WSimilar Questions
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