| A potentiometer wire AB 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 \[\varepsilon /2\] and internal resistance 3r is connected. The length AJ at which the galvanometer as shown in figure shows no deflection is- [JEE Main 10-Jan-2019 Morning] |
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A) \[\frac{11}{12}\,L\]
B) \[\frac{13}{24}\,L\]
C) \[\frac{5}{12}\,L\]
D) \[\frac{11}{24}\,L\]
Correct Answer: B
Solution :
[b] y = Potential gradient  |
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At balanced condition emf of cell  |
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