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Question

The magnetic field in a region is given by B=kB0Ly where L is a fixed length. A conducting rod of length L lies along the Y-axis between the origin and the point (0, L, 0). If the rod moves with a velocity v = v0 i, find the emf induced between the ends of the rod.

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Solution

Magnetic field in the given region, B=B0Lyk^
Length of the rod on the y-axis = L
Velocity of the rod, v = v0i^
We will consider a small element of length dy on the rod.
Now,
Emf induced in the element:
de = Bvdy

de=B0Ly×v0×dy =B0v0LydyAnd,e=B0v0L0Lydy =B0v0Ly220L =B0v0LL22 =12B0v0L

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