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

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

Solution

## The correct option is D $$\dfrac {13}{24}L$$Physics

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