I have got a problem: It's well known that two electric charges have either attractive or repulsive forces on each other. And Einstein told us that there is no message that can travel at a speed beyond c. Besides I was told that the actions and reactions between the two charges are based on the exchange of some kind of particles. So, here comes the question.Let's assume the following condition: There is one fixed charge(+)(named A),and put another neutral point(B) somewhere at a distance.If we charge B(-), it must send out a message to the A. This may be a wave. And the point B itself soon got an attractive force,which was always believed given by A.How was this force formed?My assumptions are: 1. This force was formed once B sent out the message or wave. 2. This force was formed after A received the message.A received the message, and sent something back, so that when B received, B got a force. If we choose the former, it's hard to answer how B had been "informed" the quantity of A---as no message can travel beyond c---so that the message can act on B as a force with respect to the Coulomb Law. If we choose the latter(preferable as I think), it is possible to make a machine, which can charge and discharge object B in ultra-high frequency, so that before the message is returned, B had already been discharged and no reaction force is formed---therefore it became possible to make a UFO?