First slide
Motional EMF
Question

A rod is falling vertically along a smooth rail in a uniform magnetic field as shown in the figure. If the mass of the rod is ‘m’ and length ‘l’ and resistance ‘R’, then the height through which it has to fall so that it attains terminal velocity

Moderate
Solution

ilB=mgBlvRlB=mgB2l22ghR=mgh=mgRB2l2212g=m2gR22.B4l4

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