Path: physics insights > physics >
Magnetism |
A derivation of the formulas for the torque and force on a magnetic dipole in a magnetic field, along with a brief proof that the force on a permanent dipole due to a nonuniform magnetic field is conservative. | Force on a Dipole |
A magnetic dipole is normally modeled as a current loop. However, it's sometimes simpler to work with a dipole modeled as two monopoles. On this page I show that the fields from the two models are the same; hence, one can use them interchangeably in certain situations, even though the "two-charge" model is unrealistic, as there are no magnetic monopoles. | Two-Charge Dipoles |
Derivation of the field of a dipole, in rectangular and polar coordinates. | Dipole Field |
Electric and magnetic fields of a uniformly moving charge, and a (somewhat imperfect) derivation of the Biot-Savart law of magnetostatics. | Uniformly Moving Charge |