Section 6: Magnetostatics
Magnetic fields in matter In the previous sections we assumed that the current density J is a known function of coordinates. In the presence of matter this is not always true. The atoms in matter have electrons that give rise to
Section 1: Electrostatics
Charge density
The most fundamental quantity of electrostatics is electric charge.
Charge comes in two varieties, which are called positive and negative, because their effects tend to
cancel. For example if we have +q and q at th
Section 3: Electrostatics
Laplace Equation in Spherical Coordinates Cartesian coordinates are appropriate for objects with plane boundaries. For round objects, however, it is more appropriate to use the spherical coordinates. In spherical coordinates we u