# Proton moving in magnetic field

1. Mar 26, 2009

### sdevoe

1. The problem statement, all variables and given/known data
At a particular instant a proton is traveling in the +z direction, with speed 4105 m/s. At the location of the proton there is a magnetic field of magnitude 0.25 T in the +x direction, due to current running in a nearby coil.
what is the direction and magnitude of force on the proton?

2. Relevant equations
none i think?

3. The attempt at a solution
Do you use the right hand rule possibly?

2. Mar 26, 2009

### danago

The right hand rule can give you the direction of the force, but not the magnitude.

What equation do you know that gives the force on a charged particle of charge q moving with velocity v in a magnetic field of strength B?

3. Mar 26, 2009

### rl.bhat

Try to find out the formula for the force on a charged particle in a magnetic field. The direction of the field is given by the left hand rule.

4. Mar 26, 2009

### sdevoe

the equation is F=qvB but then using the left hand rule since it is a proton would give me negative y direction if I'm not mistaken and that is incorrect?

5. Mar 26, 2009

### rl.bhat

You can use either right handed screw rule or Flemming's left hand rule.