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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 `epsilon`and internal resistance r. The cell C's emf is `epsilon/2` and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is :-
A. |
`4L/9` |
B. |
`5L/9` |
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C. |
`7L/9` |
D. |
`11L/9` |