Question

What equal charges would have to be placed on earth and moon to neutralize their gravitational attractions mass of earth 10^25 kg and mass of moon 10^23 kg​

Answer 1

Explanation:

To make the answer more interesting and to really appreciate how powerful is electric force compared to the gravitational force, let us see how many kgs of electrons need to be added to the Earth and the Moon. The answer is unbelievable. We need to add about 150 Kgs mass of electrons each to the Earth and the Moon! Compare this mass to the 6 million billion billion kgs mass of the Earth and 70,000 billion billion Kgs mass of the Moon, then we will really start appreciating how powerful the electric force is.

so the required charge is 5.7×10^13coulombs