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12.11.6 Potentiometer

A potentiometer is an instrument which allows the measurement of potential difference without drawing any current from the circuit being measured. Hence, it acts as an infinite-resistance voltmeter.

If l is the resistance per unit length of the wire AB, under balanced condition (i.e., when no current is indicated by galvanometer G), the pd to be measured is given as
=
The ratio VAB/L is called the potential gradient in the wire AB.

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