# Point charges

1. Jul 17, 2010

### pat666

1. The problem statement, all variables and given/known data
The four point charges, each of + 3.00 μC, are situated at the corners of a rectangle of length, b = 60.0 cm and width, a = 30.0 cm.

Find the magnitude and direction of the force on q2, due to the other charges.
Solved this but i needed someone to check it for me because its worth marks.

2. Relevant equations

3. The attempt at a solution
The force on Q_2 is 1.05N and the direction is 68.5 degrees

2. Jul 17, 2010

### graphene

i am not sure if anyone would work out the calculations and verify the result.
but if you show all your calculations, someone might check them.

3. Jul 17, 2010

### pat666

Hey graphene sorry I meant to put my procedure in... basically there is one force in the i direction and 1 in the j - both from a 3 uC charge. The one that is slightly difficult (not really but compared to the others) is the one that sits on the opposite corner and affects both the i and j cmpts. For this I found the radius using p's theorem and then found the force - then I split that up by Fcos(theta)i+Fsin(theta)j. then I added the i and j cmpts and resolved again. can you please tell me if this is right??? thanks

4. Jul 18, 2010

### graphene

yes, that's the way to do it.

5. Jul 18, 2010

### pat666

thanks graphene