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A metallic rod of length l & resistance ...

A metallic rod of length `l` & resistance R is free to rotate about one of its ends over a smooth rigid circular metallic frame of radius `i` in an inward magnetic field of induction B. What torque should be applied by an external angent to rotate the rod with constant angular velocity `omega` ?

Text Solution

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The correct Answer is:
`(B^(2)l^(4)omega)/(4R)`
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