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The internal resistance of a 2.1 V cell ...

The internal resistance of a `2.1 V` cell which gives a current `0.2 A` through a resistance of `10 Omega`

A

`0.2 Omega`

B

`0.5 Omega`

C

`0.8Omega`

D

`1.0Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`I=(E)/(R+r)`
`0.2=(2.1)/(10+r)`
`2+0.2r=2.1`
`0.2r=2.1`
`r=0.5Omega`
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