# Magnetic Force Directions

1. Jul 16, 2010

### eric.c

QUESTION 1

1. The problem statement, all variables and given/known data

Determine the magnetic force acting on an proton (m = 1.67 x 10-27 kg) moving at 2.9 x 106 m/s in a magnetic field of 6.8 T. The proton is moving south. The magnetic field points straight down.

2. Relevant equations

F = qvBsinø

3. The attempt at a solution

I assumed that down means into the earth, and south means bearing to the south pole, so ø is 90°. I solved the equation and F = 3.2E-12N

However, I can't seem to figure out the direction of the force.

QUESTION 2

1. The problem statement, all variables and given/known data

Determine the direction of force that the proton experiences in travelling through the field. Remember that the X represents that the magnetic field points into the page.

2. Relevant equations

none that I can think of

3. The attempt at a solution

I don't even know where to start. :(
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Jul 16, 2010

### harimakenji

You can use Fleming's Left Hand Rule to figure it out