Question

Suppose we do the following experiment: we start with a negatively charged sphere one meter away from a positively charged sphere, both carrying a charge of 1 coulomb (-1C and +1C). We bring a third negatively charged sphere (-1C also) and place it very close to (but not touching) the positive sphere. What is now the force on the first negatively charged sphere?

Answer 1

The first negatively charged sphere sees a positive charge and a negative charge, of the same magnitude as the positive charge, very close together.

The effect of the two charges cancel each other out and so the first negatively charge has ............ force acting on it.