Two identical batteries, each of $e.m.f.$ $2\, volt$ and internal resistance $1.0\, ohm$ are available to produce heat in an external resistance $R = 0.5\,ohm$ by passing a current through it. The maximum Joulean power that can be developed across $R$ using these batteries is ............. $watt$
AIPMT 1990, Medium
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${P_{\max }} = n\,\left( {\frac{{{E^2}}}{{4\,r}}} \right) = 2\,\left( {\frac{{2 \times 2}}{{4 \times 1}}} \right) = 2\,W$
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