In the circuit shown, a four-wire potentiometer is made of a 400 c m long wire, which extends between A and B . The resistance per unit length of the potentiometer wire is r = 0.01 Ω / c m . If an ideal voltmeter is connected as shown with jockey J at 50 c m from end A , the expected reading of the voltmeter will be:

Question

In the circuit shown, a four-wire potentiometer is made of a 400 c m long wire, which extends between A and B . The resistance per unit length of the potentiometer wire is r = 0.01 Ω / c m . If an ideal voltmeter is connected as shown with jockey J at 50 c m from end A , the expected reading of the voltmeter will be:, 0.50 V, 0.25 V, 0.75 V, 0.20 V

MARKS App · Accepted Answer

From the given question we take, Current in the wire, I = V R = 1 . 5 + 1 . 5 0 . 5 + 0 . 5 + 1 + 0 . 01 × 400 = 0 . 5 A Resistance of 50 cm long wire, = 50 × 0 . 01 = 0 . 5 Ω Reading = Current × Resistance = 0.5 × 0 . 5 = 0.25 V

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