A proton is at the origin. One electron is at the point (2m, 4m)
and the other is at the point (-2m, -4m). What is the net force on
the proton? F=

Correct  F = 0 N

Explanation:

All three elementary charges are in the same straight line or direction.

Since the electron and proton are opposite charged, their force is attractive and directed toward the electron.

The forces are of the same intensity-magnitude and opposite directions and are canceled, so the resultant- net force by which the electrons act on the proton is zero.

God is with you!!!

12000j is work done

need to see circuit to get time constant