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In a d.c. potentiometer, the standard cell e.m.f is 2.9 volts, when the slider is moving along with the wire at the length of

In a d.c. potentiometer, the standard cell e.m.f is 2.9 volts, when the slider is moving along with the wire at the length of 820 mm. Determine the dry cell e.m.f. at the length of 370 mm slider movement on the wire and Explain the use of d.c potentiometer.

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