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## Homework Statement

The PE of a magnetic moment in an external magnetic field is given by U = -

**u**dot

**B**. Calculate the difference in energy between the two possible orientations of an electron in a magnetic field

**B**= .6

**k**T

## Homework Equations

## The Attempt at a Solution

I realize electrons can have an up spin and down spin, but I am having a hard time doing this problem.

I believe I should be using g = 2 for the gyromagnetic ratio. So: (_h = h bar)

u

_{z}= -g u

_{B}J

_{Z}/_h

u

_{B}= e(_h)/(2m

_{e})

Unfortunately then I don't know what I should have for J

_{z}. (This is defined by my book as "any type of angular momentum).

So I guess my problem is that I don't know what I should use for angular momentum, since n and l aren't defined in the problem. Can anyone help clear this up?