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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 extents between A and B . The resistance per unit length of the potentiometer wire is `r/L=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 :

A

0.25V

B

0.75V

C

0.50V

D

0.20V

Text Solution

Verified by Experts

`i=V/R_(eq)=3/6=0.5A , Delta V_AJ)=JR_(AJ)=(0.5)(0.5)=0.25V`
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