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The length of a wire of a potentiometer ...

The length of a wire of a potentiometer is 100 cm, and the emf of its stand and cell is E volt. It is employed to measure the emf of a battery whose internal resistance is `0.5Omega.` If the balance point is obtained at l= 30 cm from the positive end, the emf of the battery is

A

`(30 E)/(100.5)`

B

`(30 E)/(100-0.5)`

C

`(30 (E-0.5i))/(100)` wher I is the current in the potentiometer wire

D

`(30 E)/(100)`

Text Solution

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The correct Answer is:
D
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