$\begin {array} {1 1} (a)\;4.8V & \quad (b)\;2.4V \\ (c)\;1.2V & \quad (d)\;None\: of \: these \end {array}$

The answer is clear if one has an understanding of what exactly is a non-ideal battery.

Here, two non-ideal batteries are connected in series and short circuited.

It is known that the potential difference across a shorted non-ideal battery is

$ 0 (V = E – ir = 0).$

Hence, the correct answer is 0 V.

Ans : (d)

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