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Q.

The length of a potentiometer wire is l. A cell of emf E is balanced at a length l/3 from the positive end of the wire. If the length of the wire is increases by l2 . At what distance will the same cell give a balanced point

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a

2l3

b

l2

c

l6

d

4l3

answer is B.

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Detailed Solution

e=iRPlx =ERPRPll3 = Ell3 second time  e =E3l2x solving x=l/2
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The length of a potentiometer wire is l. A cell of emf E is balanced at a length l/3 from the positive end of the wire. If the length of the wire is increases by l2 . At what distance will the same cell give a balanced point