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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

`(30E)/100.5`

B

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

C

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

D

`(30E)/100`

Text Solution

Verified by Experts

The correct Answer is:
D
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AAKASH INSTITUTE-Mock Test 28-EXAMPLE
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