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When two identical cells are connected either in series or in parallel across a 4 ohm resistor, they send the same current through it. The internal resistance of the cell in ohm is

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1.2

4.8

answer is C.

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Detailed Solution

$\begin{array}{l} I_{S} = \frac{2 E}{R + 2 r}; I_{P} = \frac{nE}{nR + r} = \frac{2 E}{2 R + r}; I_{S} = I_{P} \\ \frac{2 E}{R + 2 r} = \frac{2 E}{2 R + r} \Rightarrow R = r = 4 Ω \end{array}$

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