The internal resistance of a 2.1 V cell which gives a current… | Cells and internal resistance

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10…

1 2013 NEET Current Electricity Cells and internal resistance Easy

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 $\Omega$ is

A 1.0 $\Omega$

B 0.2 $\Omega$

C 0.5 $\Omega$

D 0.8 $\Omega$

Detailed Solution

$I = \frac{E}{r + R} \Rightarrow 0.2 = \frac{2.1}{r + 10}$
$r = 0.5\ \Omega$

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