For the permanent magnet / compass experiment, you have measured the magnetic field b at several distances r from the center of the permanent magnet. you plotted the natural log of the magnetic field ln(b) versus the natural log of the distance ln(r) and found a straight line with a slope of -2.9. the intercept was -15, what is the magnetic dipole moment of the magnet?

(a) 1.5 am2
(b) 2.9 am2
(c) 5.2 am2
(d) 7.5 am2
(e) 15 am2