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144r The electric power P (in W) produced by a certain battery is given by P = , where r is the (r + 0.5)2

144r The electric power P (in W) produced by a certain battery is given by P = , where r is the (r + 0.5)2 resistance in the circuit. For what value of r is the power a maximum? r=D (Simplify your answer.)

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