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refer figureA conducting cross bar of mass m and length L can slide without friction up or down on two conducting rails. The rails are connected on the bottom via a variable resistance R and battery E, so that the rails and the bar form a rectangular conducting loop. A uniform magnetic field B points into the plane of the loop. Initially the bar is at rest. What is the total force acting on the bar, moving up at speed v?I am not able to get the book answer, so please solve it.
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