In the primary circuit of a potentiometer, a cell of E.M.F. 1 V and a rheostat of 15 Ω are connected in series. If the resistance of the potentiometer wire is 10 Ω , the minimum voltage at the ends of the wire (in V ) will be

Question

In the primary circuit of a potentiometer, a cell of E.M.F. 1 V and a rheostat of 15 Ω are connected in series. If the resistance of the potentiometer wire is 10 Ω , the minimum voltage at the ends of the wire (in V ) will be, 0.1, 0.4, 0.06, 1.0

MARKS App · Accepted Answer

Voltage is minimum, when resistance is maximum. Therefore minimum voltage across the ends the wire is V = E R h + R P R P V = 1 15 + 10 10 V = 0.4 V

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