In the circuit shown, a four-wire potentiometer is made of a 
long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is 
. If an ideal voltmeter is connected as shown with jockey J at 
from end A, the expected reading of the voltmeter will be:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
JEE Main 2019
The resistance of potentiometer wire
Current in the wire
Now, 
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