Question

A charge q =+ 4.11 x 10 - 9 C is placed at the origin, and a second charge equal to -2q is placed on the x axis at the location x = +1.00 m. (a) Find the electric potential midway between the two charges. (b) The electric potential vanishes at some point between the charges. Find this value of x.

Answer 1

Well, it turns out potential is scalar, so you just add. Find where they add to zero.

Answer 2

I don't understand what you're trying to say when you're saying to add. Can you elaborate more?

Answer 3

Vtotal=V1+V2=kq1/x +kq2/x, you know distancex (1/2 of 1), and you know the two q.

when is potential zero> Set Vtotalt to zero, and solve. one distance x, the other 1-x.

You can do that.

Answer 4

Ok that makes much more sense. Thank you for your help!