# Magnetic force help ?

1. Jul 24, 2008

### thompson.1674

magnetic force help ???

1. The problem statement, all variables and given/known data
Two charged particles move in the same direction with respect to the same magnetic field. Particle 1 travels eight times faster than particle 2. However, each particle experiences a magnetic force of the same magnitude. Find the ratio q1/q2 of the magnitudes of the charges.

2. Relevant equations
B=F/qVsin(theta)

3. The attempt at a solution
BqVsin(theta)=BqVsin(theta)
and then B and sin(theta) cancel but i dont know where to go from here??
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Jul 24, 2008

### rock.freak667

Re: magnetic force help ???

$$F=BQVsin\theta$$

For the first charge,Q1.

$$F=BQ_1V_1 sin\theta$$

For the 2nd charge,Q2

$$F=BQ_2V_2 sin\theta$$

what is the relation between V1 and V2?

3. Jul 24, 2008

### thompson.1674

Re: magnetic force help ???

okay cool thanks i got it.