What is the magnitude of the net electric field at the center of the square due to the four charges in terms of q and a?.

How do we determine if they are made with matter

Suppose you live in location a, a part of the united states with a semiarid climate . you travel to location b, which is in a neighboring area . there you would find a humid continental climate. in which direction is location b likely to be , relative to location a? what is an explanation for the difference

Should teachers be allowed to have guns at school? why or why not?