A rod closing the circuit shown in figure moves along a U shaped wire at a constant speed v under the action of the force F. The circuit is in a uniform magnetic field perpendicular to the plane. Calculate F if the rate of heat generation in the circuit is Q.

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F = Qv

F=Qv

F=vQ

F=Qv

answer is B.

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Detailed Solution

Q=EI=BlvI=Fv⇒F=Qv

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