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Question

A potentiometer wire $$AB$$ having length $$L$$ and resistance $$12\ r$$ is joined to a cell $$D$$ of emf $$\epsilon$$ and internal resistance $$r$$. A  cell $$C$$ having emf $$\epsilon/2$$ and internal resistance $$3r$$ is connected. The length $$AJ$$ at which the galvanometer as shown in fig. shows no deflection is
1330736_b7f80460ff3f4b8b995c55da220e48ff.png


A
512L
loader
B
1124L
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C
1112L
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D
1324L
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Solution

The correct option is D $$\dfrac {13}{24}L$$
1942487_1330736_ans_5bf07704f3bf4713ab0dc867b93dba3c.jpg

Physics

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