Q.

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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0.8Ω

1.0Ω

0.2Ω

0.5Ω

answer is 4.

(Detailed Solution Below)

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Detailed Solution

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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