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Question

In the figure, the potentiometer wire AB of length L & resistance 9r is joined to the cell D of emf E & internal resistance r. The emf of the cell C is E / 2 & its internal resistance is 2r. The galvanometer G will show no deflection when the length AM is


A

4L/9

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B

5L/9

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C

7L/18

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D

11L/18

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