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:

In the circuit shown, a four-wire potentiometer is made of a 400 cm lo

1.	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:
Answer» 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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