Calculating the Velocity of a Proton using Magnetic Field and Electric Charge

[jhexp]

Proton's Velocity

Homework Statement

What is the speed of the proton?

Homework Equations

B=u0qv/(4pir^2)

The Attempt at a Solution

I rearranged the equation so that I solve for velocity, v. I determined that r^2 is 1.8*10^-5 m. I plugged in 1.1*10^-3 for B. The q for the proton is 1.6*10^-19.

Plugging all that and the constants in gave me a velocity of 1.2*10^8 m/s.

 

[jhexp]

Oh yeah, do you guys know the specific right hand rule for this situation? I need to use it to figure out the direction of this proton.