The problem is to find the potential at a point that is 3 meters away from two charges. (one 3 meters above, and the other 3 meters below)

q1=3μC

q2=6μC

I put that Ep=Epq1+Epq2

Epq1=K*q1/r1

Epq2=K*q2/r2

K=1/(4πε_{0})=8.988×10^{9}

This gives me:

Epq1=8.988×10^{9}*(3×10^{-6}/3)=8988J

Which immediately set some bells off for me. Isnt that quite a bit of energy for a charge three meters away? By the same formula, Epq2 equals 17976J, for a total potential of 26964J. Maybe I am wrong, but it seems like a very high potential. I will admit that I havent wrapped my head around how large of charge a Coulomb is, so maybe 3μC and 6μC are very large amounts of charge, but something seems wrong to me…

Can someone take a look, and see if I did something wrong? Thank you.

http://ift.tt/1fo4aXN