Magnetic moment of a rotating charge

[ADewpersad]

Homework Statement

a charge 5 x 10^-6 C is located at the end of a 0.30m insulating rod. the rod rotates at w = 100 rad/s. find the magnetic moment of the charge.

Homework Equations

hint: the charge travels around a circle in a time equal to the period of the motion.

The Attempt at a Solution

i know that i must use the equation = u = qwr²/2

 

[Redbelly98]

Welcome to Physics Forums

This looks pretty straightforward, given the equation:

i know that i must use the equation = u = qwr²/2

Which quantity -- q, w, or r -- are you having trouble finding?

 

[ADewpersad]

im battling to find the radius, please help.

 

[Redbelly98]

Okay.

That will depend on where the axis of rotation is located. That is, does the stick simply rotate about it's own center? Or is the opposite, uncharged end fixed in place, and it rotates about that end?

The answer to this is not clear from what you posted. Is there a figure, or additional information, in the problem statement that would address this question?