A potentiometer wire AB having length L and resistance 12 r is joined to a cell D of emf `epsi//2` and internal resistance 3r is connected. The length AJ at which the galvanometer as shown in fig. Shows no deflection is :
A
`(11)/(12)` L
B
`(11)/(24)` L
C
`(13)/(24)` L
D
`(5)/(12)` L
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