Respostas

2014-02-15T18:38:02-02:00
Resposta

d = 4m
E = 30N/C

E = k.Q/d²
30 = 9.10^9Q/4²
30 = 9.10^9Q/16
9.10^9Q = 30.16
9.10^9Q = 480
Q = 480/9.10^9
Q = 53.10^-9C

Ou

Q = 53nC
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