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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 e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is `0.5 Omega`. If the balance point is obtained at I = 30 cm from the positive end, the e.m.f. of the battery is .
where i is the current in the potentiometer wire.

A

0.2 E

B

0.3 E

C

0.4 E

D

0.5 E

Text Solution

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The correct Answer is:
B
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