What Is the Direction of the Magnetic Force on a Proton?

[eric.c]

QUESTION 1

Homework Statement

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.

Homework Equations

F = qvBsinø

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

Homework Statement

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

Homework Equations

none that I can think of

The Attempt at a Solution

I don't even know where to start. :(

 

[harimakenji]

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