Two identical copper balls are 7 meters apart from each other. The volume of the balls is 1 cm 3 . Suppose someone can move one electron from each...

Two identical copper balls are 7 meters apart from each other. The volume of the balls is 1 cm3. Suppose someone can move one electron from each atom of ball A and give it to ball B.

What is the magnitude of the electrostatic force between two copper balls?

(in units of N)  

What is the magnitude of the gravitional force between two copper balls?

(in units of N)  

How many electrons would need to be transferred in order to balance these two forces?

(electrons)