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4. In the figure the potentiometer wire ...

4. In the figure the potentiometer wire , B of length L and resistance 9r is joined to the cell D of e.m.f e and internal resistance r. The emf of cell C is and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is $. 2r G 3 @ @ anntentiometer

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