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Q.

A copper rod AB of length l  is rotated about end A with a constant angular velocity ω . Find electric field at a distance x  form the axis of rotation

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a

mω2xe

b

mωxel

c

meω2x

d

mxω2l

answer is A.

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Detailed Solution

When rod rotates, electron in it also rotates which produce electric field E at distance x . Force in electron, Fe=eE=mω2x

 ∴  E=mω2xe

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