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Halliday-cap 22-vol.3- Rar - P22 013

Solução do exercícios 1 aqo 51 do Capítulo 22- Cargas Elétricas- 4 ed. VOL.3 A solução dos exercícios está em inglês

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13. The magnitude of the force of either of the charges on the other is given by F = 1 q(Q − q) 4πε0 r2 where r is the distance between the charges. We want the value of q that maximizes the function f (q) = q(Q − q). Setting the derivative df /dq equal to zero leads to Q − 2q = 0, or q = Q/2.