Respostas

2013-09-17T00:09:20-03:00
Dados:
Q = ?
d = 30 cm = 0,3 m = 3.10^-1 m
E = 1.10^-8 N/C
ko = 9.10^9 N.m²/C²

E = ko.Q/d²
E.d² = ko.Q
E.d²/ko = Q
1.10^-8.(3.10^-1)²/9.10^9 = Q
1.10^-8.9.10^-2/9.10^9 = Q
9.10^-10/9.10^9 = Q
1.10^-10.10^-9 = Q
1.10^-19 C = Q
2 4 2
2013-09-17T00:16:52-03:00
D = 30cm = 0,3m
E=k.Q/d²   =  10^-8= 9.10^9.Q/ (0,3)²
10^-8=9.10^9.Q/0,09
100.10^9 Q=10^-8
10^11Q=10^-8
Q=10^-8/10^11
Q=10^-19 C