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What is meant by the sensitivity of a potentiometer?

A battery E₁ of 4 V and a variable resistance R h are linked in series with the wire AB of the potentiometer. The length of the wire of the potentiometer is 1 metre. When a cell E ₂ of e.m.f. 1.5 volt is connected among points A and C, no current flows through E ₂ Length of AC = 60 cm.

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