A cell of electromotive force (e.m.f.) E and internal resistance r is connected to a resistor of resistance R.
A maximum power P can be dissipated by the resistor without overheating.
What is the maximum value of E if the resistor does not overheat?
1 )
$R\sqrt {\frac{P}{{(R - r)}}} $
2 )
$R\sqrt {\frac{P}{{(R + r)}}} $
3 )
$(R - r)\sqrt {\frac{P}{R}} $
$(R + r)\sqrt {\frac{P}{R}} $
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