- #1

Ben000

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## Homework Statement

You have two charges (q1 = -15uC and q2 = 3uC) separated by a distance (d = 3m). We want to calculate the electric field, E (vector quantity), at a location x relative to charge q2 located on a line connecting the two charges. Note that x could be anywhere on that line. Calculate the Coulomb force experienced by each charge. Give both magnitude and direction.

Also, Find the location x, where E = 0.

## Homework Equations

Coulomb's Law:

F=k q1q2r2 or 14πϵ0 q1q2r2

Electric field and potential for a point charge:

EV==k qr2 or 14πϵ0 qr2k qr or 14πϵ0 qr

I don't know how to enter them in a fancy way, I tried copy pasting them from the sticky.

## The Attempt at a Solution

So I know I have to first come up with x before I can solve for E. But if I set up the equation it seems impossible.

0=8.99^9(3uC/x)

There's no way to get x on the other side without it equaling zero!

So I don't know how to move forward in the problem.

For the charge part, I don't really understand magnitude and direction.

As a guess I would say that both charges experience an equal force from each other, only differing in direction. Because the negative one would go towards the positive.

F=8.99^9(|15uc*3uc|)/3^2

F=5^-12

That sounds like a really small number and I don't know what unit it would be.

PLEASE help me I don't want to fail my physics. I like this stuff in concepts but I can't do the problems.