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A cell can be balanced against 110 cm an...

A cell can be balanced against `110 cm` and `100 cm` of potentiometer wire, respectively with and without being short circuited through a resistance of `10 Omega`. Its internal resistance is

A

`1 Omega`

B

`2 Omega`

C

`3 Omega`

D

`4 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
Given, `l_(1)=110 cm`,
`l_(2)=100 cm`
and `R = 10 Omega`
The internal resistance of the cell
`r=((l_(1)-l_(2))/(l_(2)))R`
`= ((110-100)/(100))xx10=1 Omega`
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