If the rod is moving with a constant velocity of 12 cm /s then the power (in watt) that must be supplied by an external force in maintaining the speed is p mW . Find the value of p.( Given B=0.5 Tesla ,l=15cm,v=12cm/s, Resistance of rod RAB=9.0mΩ

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answer is 9.00.

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Detailed Solution

E=Bvli=ER=BvlRP=iE=BvlR×Bvl ⇒P =B2v2l2R=0.5×0.5×0.12×0.12×0.15×0.159×10−3=9×10−3 W

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