# Proton moving in magnetic field

## Homework Statement

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?

none i think?

## The Attempt at a Solution

Do you use the right hand rule possibly?

## Answers and Replies

danago
Gold Member
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?

rl.bhat
Homework Helper
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.

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?

rl.bhat
Homework Helper
You can use either right handed screw rule or Flemming's left hand rule.