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A ten meter long potentiometer wire is c...

A ten meter long potentiometer wire is connected to accumulator of emf 2volts and negligible internal resistance. A lechlanche cell gives null point at 4 meter. If the diameter of the wire is doubled keeping the length same. The position of new null point will be

A

`2m`

B

`4m`

C

`6m`

D

`8m`

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The correct Answer is:
B
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