Respostas

2013-10-13T10:13:41-03:00
F= \frac{kQq}{d^2}

F'= \frac{kQq}{(d/2)^2} = \frac{kQq}{d^2/4} = kQq \frac{4}{d^2} =4 \frac{kQq}{d^2}

Portanto F'=4F
Alternativa D.
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