# Force between moving charges

1. Apr 1, 2009

### j88k

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

http://img207.imageshack.us/img207/4245/picture2jwi.png [Broken]

2. Relevant equations

see picture

3. The attempt at a solution

I don't know what is going wrong with part B and I'm running out of attempts! Please help me with that and part C as well.

Thanks

Last edited by a moderator: May 4, 2017
2. Apr 1, 2009

### LowlyPion

F = q2v X B1 = q2v *μo*q1v/(4π*2d2)

Your distance squared is 2d2 isn't it?

3. Apr 1, 2009

### LowlyPion

For part C) consider that

εoμo = 1/c2

4. Apr 1, 2009

### j88k

didn't get it.. one more attempt left..

http://img17.imageshack.us/img17/3769/picture2zjr.png [Broken]

and the answer for part C would be: The magnitude of the electric force is greater than the magnitude of the magnetic force. ?

Last edited by a moderator: May 4, 2017
5. Apr 1, 2009

anyone?

6. Apr 2, 2009

### LowlyPion

I think the problem is that the second charge is moving at an angle to the field generated by the other charge.

I think the F then is a factor of √2/2 off. (The value of sinθ that v is relative to the B field.)