Magnetism and Matter.

11 lessons87 min4 simulations10 practice questions

This chapter treats magnetism as a subject of its own. It starts from the bar magnet: its field lines, why it behaves like a solenoid, the torque and energy of a magnetic dipole in a uniform field and the dipole's far field, borrowed from the electric dipole. Gauss's law for magnetism records that there are no magnetic monopoles. The second half describes matter in a field through magnetisation M, magnetic intensity H, susceptibility χ and permeability μ, and sorts materials into diamagnetic, paramagnetic and ferromagnetic.

Also called: magnetism · bar magnet · magnetic materials