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A potentiometer wire of length 4 m and r...

A potentiometer wire of length 4 m and resistance `8 Omega` is connected in, series with a battery of e.m.f. 2 V and negligible internal resistance. If the e.m.f. of cell balances against length of 217 cm of the wire, find the e.m.f. of cell. When the cell is shunted by assistance of `15 Omega`,the balancing length is reduced to 200 cm. Find the internal resistance of the cell

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