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Q.

If the external resistance is equal to internal resistance of a cell of emf E. The current across the circuit is

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a

$\frac{E}{r}$

b

$\frac{r}{E}$

c

$\frac{r}{2 E}$

d

$\frac{E}{2 r}$

answer is D.

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Detailed Solution

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$i = \frac{E}{R + r} \Rightarrow i = \frac{E}{r + r} (∵ R = r) \Rightarrow i = \frac{E}{2 r}$

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