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**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?