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Question

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

A
0.5 Ω
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B
0.2 Ω
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C
0.1 Ω
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D
0.8 Ω
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Solution

The correct option is A 0.5 Ω
Given, current, I=0.2 A
Voltage, ϵ=2.1 V
Resistance, R=10 Ω
Let the internal resistance be r.
We know, I=ϵR+r
or, IR+Ir=ϵ

IR+Ir=ϵ
0.2×10+0.2×r=2.1
2+0.2r=2.1
r=0.5 Ω

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