@ellll-i F = k q1q2 / R^2;
R = 0,06 m;
q1 = 10 * 10^-6 C = 10^-5 C;
F = 30 N;
q2 = F * R^2 / (k q1);
q2 = 30 * 0,06^2 / (9 * 10^9 * 10^-5 ),
q2 = 0,108 / (9 * 10^4) = 1,2 * 10^-6 C = 1,2 microCoulomb.
Ciao @ellll-i
F = ko*q1*q2/d^2
30*10^-4 = 9*10^9*10^-5*q2/36
q2 = 30*36*10-^4/(9*10^4) = 1,20*10^-6 Co
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