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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 10Ω is

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By Expert Faculty of Sri Chaitanya
a
0.8Ω
b
1.0Ω
c
0.2Ω
d
0.5Ω
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detailed solution

Correct option is D

I=εR+ror  IR+Ir=εHere,  R=10Ω, r=?, ε=2.1V,I=0.2A ∴  0.2×10+0.2×r=2.1 2+0.2r=2.1 0.2r=0.1  or  r=12=0.5Ω


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