4ª aula
Lei de Coulomb (II)
Borges e Nicolau
Exercícios de Revisão
Revisão/Ex 3:
resolução
a) Da lei de Coulomb, F = k.Iq1I.Iq2I/d2, concluímos que triplicando d a intensidade da força fica dividida por 9. Portanto: F1 = 20 N
b) Do gráfico 2:
F = k.[I(q1+q2)/2I.I(q1+q2)/2I]/d2 => 90 = 9.109[(q1+q2)2/4]/32 =>
q1+q2 = 6.10-4 C
Respostas: a) 20 N b) 6,0.10-4 C
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