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In the circuit shown, a four-wire potent...

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 Omega //cm`. If an ideal voltmeter is connected as shown with jockey `J` at 50 cm from end A, the expecteed reading of the voltmeter will be _______ volts.

A

0.75 V

B

0.25V

C

0.20 V

D

0.50 V

Text Solution

Verified by Experts

The correct Answer is:
B
Reading = Potential gradient x length
`=3/(0.5 + 0.5 + 4 + 1) xx 4/400 xx 50 = 1/4`
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