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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 :

Text Solution

Verified by Experts

` i= (V)/(R _ (eq ) ) = ( 3 ) /(6) = 0.5 A `
` Delta V _ (AJ) = iR_ ( AJ ) = ( 0.5) (0.5) = 0.25 V `
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