Electric Fields

1) A positive charge of  2,3*10^-6 C  is between two parallel plates. It is close to the negative plate. The electric field between the two plates is 1500 N/C. If we move the particle 2 cm closer to the positive plate, determine how much work we need to do.

2) In the example above, determine how much electric potential energy the charge gained.

3) If everything else was kept the same, determine how much work you would need to do to move a C charge. The only difference is that it is double the charge.

4) Four equal charges Q= -5 mC are placed at the vertices of a square of side 12 cm.

Find the net force (magnitude and direction) acting on the charge in the upper right corner. 

HJÆLP!