| 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 expected |
| reading of the voltmeter will be :- [JEE Main 8-4-2019 Afternoon] |
 |
A) 0.20 V
B) 0.25 V
C) 0.75 V
D) 0.50 V
Correct Answer: B
Solution :
[b]  |
Resistance of wire   |
Now voltmeter reading = i (Resistance of 50 cm length)  volt |
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