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Figure shows a potentiometer circuit. Le...

Figure shows a potentiometer circuit. Length of the potentiometer wire is `l` .As shown a cell of emf E is balanced by length `l/2` of the potentiometer wire. Figure (2) shows cell of emf `E_(1)` in the place of E and a combination of n cells each of emf E in the place of `E_(A)` .For balancing `E_(A)` at `1/2` ,n should be

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