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In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is r = 0.01 Ω /cm. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be – 1.5V, 1.5V 1 Ω 0.5 Ω , 0.5 Ω A B V 50cm 100cm J

1. 0.75 V
2. 0.25 V
3. 0.50 V
4. 0.20 V

Correct answer: 0.25 V

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