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Dependence of Resistance on Temperature

A potentiomet...

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A potentiometer wire of length L and a resistancer are connected in series with a battery of e.m.f.E and a resistance r,. An unknown e.m.f. E isbalanced at a length of the potentiometer wire.The e.m.f. E will be given by7.\lbrack Re-AIPMT-2015\rbrack

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