(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A point charge 10 km in the air with a charge of 40 coulombs

A point charge 5 km in the air with a charge of -40 coulombs

A point chare 2 km in the air with a charge of 10 coulombs

-Find the electric potential due to these charges at a point which at a height of 8 km and on the vertical line passing through the charges.

2. Relevant equations

kq1/r1 + kq2/r2

3. The attempt at a solution

So I summed them up

v = k (40C/2000m - 40C/3000m + 10C/6000m) = 7.5E7

My question is, is do I need to convert km to m and was I correct in subtracting the negative 40 coulomb charge from the rest of the positive charges?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Calculating voltage from multiple point charges

**Physics Forums | Science Articles, Homework Help, Discussion**