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Q.21 A rectangular loop of resistance R, and sides I and x, is pulled out ofa uniform magnetic field B with asteady velocity v. The necessary force F required for maintaining uniform velocity of withdrawal is-B2122(C) RBl2B212v(B) B 1 V(D) 0

Answer»

emf = BLv

and i = BLv/R

also, F = BLi = B²L²v/R

Note : you can also, do this question by checking the dimension of the options.. and matching it with dimension of F



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