Question

Lei de coulomb. Achar a distância. Vale 70 pontos.

Answer 1

$F = \frac{K |Q_1|*|Q_2|}{d^2} \\\\ 250 = \frac{9*10^9 * 3*10^-^6*4*10^-^6}{d^2} \\ d^2 = \frac{9*10^9 * 3*10^-^6*4*10^-^6}{250} \\ d^2 = \frac{108*10^-^3}{250} \\ d^2 = \frac{108*10^-^3}{25*10} \\ d^2 = 4.32*10^-^4 \\ d^2 = 0.000432 \\ d = \sqrt{0.000432} \\ \boxed{d = 0.0207m}$

d = 0.0207 metros ou $207*10^-^4m$.