# Electric Fields Problem

1. Feb 11, 2010

### llama0lover

A 40 Micro Coluomb test charge is placed in an electric feild produced by a 5 Coloumb charge. It expierences a 6 newton force. What is the strength of the electric feild at this point? If the test charge has a mass of 3 x 10 ^ -20 Kg, what acceleration does it expierence?

I Think I could use the 6 newton force and divide it by the first force 5 Coloumbs to get the electric feild, and then on from their I could use a force table get the acceleration, but I am not exactly positive how to set up the Free body diagram and force table for this.

I'm Just stuck on how to find the acceleration really

2. Feb 11, 2010

### kuruman

1. How is force on a charge related to the electric field in which this charge finds itself?
2. 5 coulombs is a charge not a force
3. Assuming that you know the force on the charge and the mass of the charge. What does Newton's Second Law say about the acceleration?

3. Feb 11, 2010

### llama0lover

oh you can use F=ma to figure out the acceleration thanks :-) also, how would you know where the first charge the 5 coluombs was in relation the the test charge?

Last edited: Feb 11, 2010
4. Apr 6, 2010

### Mintea

You can find the distance (if you really wanted to) with the definition of electric force, F - (kq1q2)/d2. You know F and the charges, and k's a constant. And distance can't be negative, so you don't have to worry about that when evaluating the square root ;)

(hello classmate! See, I TOLD you I'd get on here!)