Uniform magnetic field and electric field

1. Mar 16, 2014

Sixty3

1. The problem statement, all variables and given/known data
How would you find the period of a charged particle in an uniform electric and magnetic field?
The charged particle has velocity that is perpendicular to the magnetic and electric field (which are directed in the x-axis).

2. Relevant equations
F=q(E+vxB)

3. The attempt at a solution
In the absence of an electric field, I see that the period is given by T=2pi(m/qB). Not sure how I can find it when an electric field is present.

2. Mar 16, 2014

Rellek

Hey, when you say period, do you mean that the particle is orbiting something?

3. Mar 16, 2014

Sixty3

I misunderstood the question, but I need to find the magnitude of the velocity after 'c' revolutions.

4. Mar 16, 2014

Staff: Mentor

What does "directed in the x-axis" mean? If you were to write the three Cartesian components of, say, the electric field vector, what might it look like?

5. Mar 16, 2014

Sixty3

I am lost with this question, but to go about finding the velocity at time t I think it's v=q/m (integral)[E+vxB]dt, it's just the limits of integration I'm not able to find.