Formulae:
The electric field at a point on the perpendicular bisector of a uniformly charged thin rod:
The electric field at a point on the axis of a uniformly charged thin ring:
Gauss’s Law:
For the electrostatic field:
The electric potential:
The electric potential at a point on the axis of a uniformly charged thin ring:
The work done by the electric field force:
The electric polarization of the isotropic dielectric:
The surface bound charge density on the surface of dielectric:
The electric displacement：
For the isotropic dielectric:
Gauss’s Law about
:
The capacitance of a parallel-plate capacitor:
The capacitance of a cylindrical capacitor:
The capacitance of a spherical capacitor:
Parallel combination of capacitors:
Series combination of capacitors:
The energy stored in a capacitor:
The energy stored in the electrostatic field:
The magnetic force that acts on a charge q moving with velocity v:
The magnetic force on an arbitrarily shaped wire carrying current I :
The torque on a current loop when the loop is placed in a uniform external magnetic field:
The Biot-Savart law:
Gauss’s law in magnetic field:
The magnetic field at a distance of r from a straight wire segment carrying current I:
The magnetic field on the axis of a circular current loop:
The magnetic field on the axis of a solenoid:
Ampere’s law:
The general form of Ampere’s law:
magnetization of isotropic magnetic medium:
surface bound current density on the surface of magnetic medium:
magnetic-field intensity:
For isotropic magnetic medium:
Ampere’s law about
:
Faraday’s law of induction:
motional emf:
induced emf:
mutual-inductance:
mutual-induced emf:
self-inductance:
self-induced emf:
The energy stored in the magnetic field of an inductor carrying a current I:
The energy stored in the magnetic field:：
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