Respostas

2014-02-11T19:52:32-02:00
Resposta

Convertendo as unidades

Q = 2.10^-6C
q = 4.10^-6C
K = 9.10^9
d = 20cm = 0,2m

Formula

F = K.Q.q/d² 
F = 9.10^9.2.10^-6.4.10^-6 /0,2²
F = 72.10^-3/0,04
F = 1800.10^-3
F = 1,8 N
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