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n the figure, the potentiometer wire AB of length L and resistance 9r is joined to the cell D of....
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n the figure, the potentiometer wire AB of length L and resistance 9r is joined to the cell D of emf ε and internal resistance r. The cell C’s emf is ε/2 and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is