# Electric field

1. Mar 25, 2013

### Jabababa

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

a 030 kg ball is suspended in a uniform electric field as shown. If the charge on the ball is 500 x10^-4 C, what is the electric field strength?

2. Relevant equations

E= F/Q

3. The attempt at a solution

I did this by using the triangle method. draw the forces with a triangle(look at the attachment).
My question is did i draw the triangle right? Does the direction of the Electric field affect my answer?

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2. Mar 25, 2013

### ap123

Since the ball is in equilibrium, the forces on it must add to zero.
Look at the direction of the tension force in your triangle.

3. Mar 25, 2013

### Jabababa

oh my, thank you so much ap123!

I just got the tension force backwards, now it makes much more sense!!!! thank you !!

4. Mar 25, 2013

### ap123

Have you worked out the value for the electric field?

5. Mar 25, 2013

### Jabababa

yes i got 1.25 x10^3 N/C to the left