Electromagnetism

This mind map is a work in progress. Its purpose is to cover all of the undergraduate university level studies in electromagnetism, with only brief references to optics and solid state physics.Any comments, thoughts, or questions regarding this map may be directed to:crystal "dot" 37 "at" gmail "dot" com.

UNITS: Coulombs (C)

UNITS: N/C or V/malso seen it called "electric flux density"

The direction of the force on charge 1 due to charge 2 is along the unit vector r21.If the charges have the same sign, then q1q2 is positive and thus the force on 1 is positive (repelling it).If the charges have opposite signs, then q1q2 is negative and thus the force on 1 is negative (attracting it).

UNITS: tesla (T)also referred to as:- magnetic flux density- magnetic field density- magnetic induction

"The Biot-Savart law is as fundamental to electromagnetism as

UNITS: amperes (A)

UNITS: A/m^2

Ohm's LawV = IRV is electric potential,I is electric current,R is electrical resistance.

ρ = static resistivity, aka specific electrical resistanceUNITS: ohm metres, Ωmρ = R * A / LA is cross-sectional area (in m²)L is length of specimen (in m)and R is resistance of specimen (in Ω)ρ = E / JE is the magnitude of the electric field (in V/m)J is the current density (in A/m²)

Any electric charge which accelerates, or any changing magnetic field, produces electromagnetic radiation.

This is a BIG topic... there is a lot that needs to be expanded upon here.

Ampère's Circuital Law(with Maxwell's correction)

Maxwell's equations link together the concepts of electric field E, magnetic field B, electric charge density ρ, and electric current I.