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A rod `PQ` of length `l` is rotating about end `P`, with an angular velocity `omega`. Due to electrifugal forceed the free electrons in the rod move toward the end `Q` and an emf is created. Find the induced emf. |
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Answer» The accumulation of free electrons will create an electric field which will finally belance the centrifugal forces and a steady state will be reached. In the steady state `m_(e)omega(2)x=eE`. `V_(P)-V_(0)=int_(x-0)^(x=l) barE.d barx=int_(0)^(l)(m_(e)omega^(2)x)/(e )dx=(m_(e)omega^(2)l^(2))/(2e)` |
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