Current Electricity and Electrical InstrumentHard
Question
In the figure, the potentiometer wire AB of length L and resistance or is joined to the cell D of emf e and internal resistance r. the cell C′s emf is 
and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is
and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ isOptions
A.
B.
C.
D.
Solution
Potential gradient x = 
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According to question
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