# Homework Help: Electric force and charge

1. Mar 10, 2008

### n77ler

[SOLVED] Electric force and charge

1. The problem statement, all variables and given/known data

A positive charge of 2.90 μC is at rest at the origin. An electric force of 65.5 x 10-6 N acts on the charge as shown in the figure below. What is the x-component of the electric field at the origin?

2. Relevant equations

F=kQ/r^2
E=kq1q2/r^2

3. The attempt at a solution

I subbed the charge and force into F=k Q/r^2 and solved for r thinking I could dos somehting with it but it is a hugeeee number so I doubt im doing it right.

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2. Mar 11, 2008

### SWFanatic

F=Eq, use sin and cosine to find the components.

3. Mar 11, 2008

### tiny-tim

Wrong formulas …

Hi n77ler!

You have the wrong formulas!

Not every electric charge problem asks you to find the force - in this case, they've told you what the force is, and only asked you to find the field!

Just use SWFanatic's formula.