A conducting \(\operatorname{rod} A C\) of length \(4 l\) is rotated about a point \(O\) in a un....

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A conducting \(\operatorname{rod} A C\) of length \(4 l\) is rotated about a point \(O\) in a uniform magnetic field \(B\) directed into the paper. \(A O=l\) and \(O C=3 l\). Then
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