\(A B\) and \(C D\) are fixed conducting smooth rails placed in a vertical plane and joined by a....

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\(A B\) and \(C D\) are fixed conducting smooth rails placed in a vertical plane and joined by a constant current source at its upper end. \(P Q\) is a conducting rod which is free to slide on the rails. A horizontal uniform magnetic field exists in space as shown. If the \(\operatorname{rod} P Q\) is released from rest then,
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