Ayyayo, that motional emf formula—EMF = Blv—is like a steady train: magnetic field B, length l of the rod, and velocity v all in a straight line. Induced current you get from Ohm's law, I = EMF/R, and the retarding force is F = BIl. It’s all so neat on paper. But I’ll tell you, seeing those bright students cross the street to that coaching centre, I regret not mastering this properly for my own JEE—I could explain it to them properly now, instead of watching them leave for someone else’s blackboard.
#exams#study
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