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A cell has an emf 1.5V. When connected a...

A cell has an emf 1.5V. When connected across an external resistance of `2Omega`, the terminal potential difference falls to 1.0V. The internal resistance of the cell is:

A

`1.5 Omega`

B

`1.0Omega`

C

`10.0 Omega`

D

`2.0Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
For a cell, `E=V+lr and lR`

`rArr" "(E-V)/V=(Ir)/(IR)=r/R`
`rArr" "(1.5-1.0)/(1.0)=r/(20)`
`rArr" "r=(20xx0.5)/(1.0)=10Omega`
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