Answer to Question #189306 in Electricity and Magnetism for Aqsa

Question

Consider that earth is a positively charge object having charge equals to its mass (6×1024C)

and the moon is a negativity charge particle of charge (7×1022C)

a) Find the coulomb force between them if the distance is 384,403 km

b) if sun, moon and earth are collinear and the distance between sun and the center of moon and

earth is 149,597,887 km find Electric Field at sun?

Answer 1

a)

$F=|\frac{kq_1q_2}{r^2}|=\frac{9\cdot 10^9\cdot 6\cdot 10^{24}\cdot 7\cdot 10^{22}}{3.84403^2\cdot 10^{16}}=2.6\cdot 10^{40}~N.$

b)

$E=\frac{k(q_1+q_2)}{r^2}=\frac{9\cdot 10^9\cdot (6\cdot 10^{24}-7\cdot 10^{22})}{1.49597887^2\cdot 10^{22}}=2.4\cdot 10^{12}~\frac NC.$