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In 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 Cs emf is ϵ/2 and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is
- 4L9
- 5L9
- 7L18
- 11L18
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