Two parallel plates are 1 cm apart and are connected to a 500 v source. what force will be exerted on a single electron half way between the plates?

8*10^-15 N

Explanation: In order to calculate the force applied on an electron in the middle of the two planes at 500 V we know that,  F=q*E

The electric field between  the plates is given by:

E = ΔV/d = 500 V/0.01 m=5*10^3 N/C

the force applied to the electron is: F=e*E=8*10^-15 N

so easy. just google the electromagnetic waves and it’ll pop up.

dang that balls went far