1. A positive charged rod is held near, but does not touch a neutral electroscope. The charge on the knob becomes 1) positive and the leaves become positive 2) positive and the leaves become negative. 3) - and the leaves become + 4) - and the leaves become -. I chose 1), but it's wrong. I am not really familiar with electroscope and how they work. 2. There are two positive charged spheres, A and B (A is at the left, B is at the right), 3 meters apart. There is a point x left to the A. If sphere A is moved toward sphere B, the electirc field intensity at point x will 1) decrease 2) increase 3) remain the same I chose 2) since E=V/d, so when d decreases, E increases. But the answer is 1), so I am wondering if the voltage changes as well? so in general, If there is a change in distance between two charges, will the voltage or potential difference change? if not, then what will affect the potential difference? Thanks.