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AB is a potentiometer wire of length 100...

`AB` is a potentiometer wire of length `100 cm`. When a cell `E_(2)` is connected across `AC`, where `AC = 75 cm`, no current flows from `E_(2)`. The internal resistance of the cell `E_(1)` is negligible.

Find the potential gradient along `AB`.

A

`0.01 Vcm^(-1)`

B

`0.03 Vcm^(-1)`

C

`0.04 Vm^(-1)`

D

`0.02 Vcm^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
`k = (E_(1))/(100) = (2)/(100) 0.02 V cm^(-1)`
`E_(2) = k(75) = 0.02 xx 75 = 1.5 V`
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