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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

`0.5Omega`

B

`0.8Omega`

C

`1.0Omega`

D

`0.2Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
`V=E-Ir=IR`
`rArr 2.1-0.2r = 0.2 xx 10`
`rArr r=0.5 Omega`.
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