quarta-feira, 26 de fevereiro de 2020

Cursos do Blog - Eletricidade

4ª aula
Lei de Coulomb (II)

Borges e Nicolau

Exercícios de Revisão

Revisão/Ex 3: resolução

a) Da lei de Coulomb, F = k.I
q1I.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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