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Fig. shows a rectangular conducting loop...

Fig. shows a rectangular conducting loop PQSR in which arm RS of length l is movalbe. The loop is kept in a uniform magnetic field B directed downwards perpendicular to the plane of the loop. The arem RS is moved with a uniform speed v. Deduce an expression for
(i) the emf induced across the are RS.
(ii) the external force required to move the arm, and
(iii) the power dissipated as heat.

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