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Q.

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is :

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a

1.0 Ω

b

0.2 Ω

c

0.5 Ω

d

0.8 Ω

answer is C.

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Detailed Solution

I=Er+R ⇒0.2=2.1r+10 ⇒r=0.5Ω
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The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is :