Construct Your Own identical spherical conducting space ships in deep space where gravitational fields from other bodies are negligible compared to the gravitational attraction between the ships. Construct a problem in which you place identical excess charges on the space ships to exactly counter their gravitational attraction. Calculate the amount of excess charge needed. Examine whether that charge depends on the distance between the centers of the ships, the masses of the ships, or any other factors. Discuss whether this would be an easy, difficult, or even impossible thing to do in practice.

Solution : Step 1 We need to imagine the two identical space ships of mass 4 ×10 kg i 5 s at a distance 50 m from each other. We need to Find the gravitational attraction force between the ships. How much charge on each ship should place to counter the attractive gravitational force between them