A cell needed \(0.30 \mathrm{~m}\) of the wire of a potentiometer to balance its e.m.f. but only \(2.0 \mathrm{~m}\) of its p.D. when a resistance of \(4 \Omega\) was connected across its terminals. Calculate the internal resistance of the cell.

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A cell needed \(0.30 \mathrm{~m}\) of the wire of a potentiometer to balance its e.m.f. ...

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