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JEE Main 2019
10-01-2019 S1
Question
A potentiometer wire $A B$ having length $L$ and resistance $12 r$ is joined to a cell $D$ of emf $\varepsilon$ and internal resistance $r$. A cell C having emf $\frac{\varepsilon}{2}$ and internal resistance $3 r$ is connected. The length AJ at which the galvanometer as shown in fig. shows no deflection is
Select the correct option:
A
$\frac{11}{12} \mathrm{~L}$
B
$\frac{11}{24} \mathrm{~L}$
C
$\frac{5}{12} \mathrm{~L}$
D
$\frac{13}{24} \mathrm{~L}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
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Physics
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