The amount of potential energy possessed by an elevated object is equal to

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

What can you increase the strength of an electromagnet by