Respostas

2014-05-25T21:57:15-03:00
F = k * q*Q/d²
3,6*10² = 9*10^9 * Q²/2²

14,4*10² = 9*10^9 * Q²

14,4*10²/9*10^9 = Q²
1,6 * 10^-7 = Q²
0,16 * 10^-6 = Q²

Q = 0,4*10^-3 = 0,4mC
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