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Finding a point midway between two electric charges

  • Thread starter Sterfrye36
  • Start date
1. Homework Statement
Two point charges of magnitude 2nC and -4nC are separated by 35 cm. The Coulomb constant is 8.98755e9 Newtons (Meters squared/ Coulombs squared). What is the potential difference between a point infinitely far away and a point midway between the charges?

R= .175


2. Homework Equations

E = Kc (q/r^2)

Magnitude of electric field = Coulomb's Constant (value of the charge/ Distance squared)

Delta V = Kc (q/r)

Potential difference = Coulomb's Constant (value of the point charge)/ (distance to the point charge)


3. The Attempt at a Solution
I tried running the two separate charges into the first formula (E1= 587, E2= -1174), then added them together, then ran the second formula with the difference of the first two (1761) and ended up with (9.04e13).

Call me crazy, but isn't that quite a bit of voltage for such a tiny amount of charges? Where am I going wrong?
 

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