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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:

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0.50V

0.75V

0.25V

0.20V

answer is D.

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Detailed Solution

Resistance of wire AB=400×0.01=4Ω

i=63=0.5A

Now voltmeter reading = i (Resistance of 50 cm length)

=(0.5A)(0.01×50)=0.25volt

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