electromagnetics Flashcards
electromagnetics
deals with the interaction between electricity and magnetism
Maxwell’s equations
fundamental unification of electric and magnetic fields predicting electromag wave phenomena
applications of electromag e.g
radar, loud speaker [because of ac current], wifi
principles
- electric current produces mag field
- charge moving in mag field creates force
- changing mag field can produce voltage.
where
around permanent magnets and around wires that carry current.
properties
-two poles
-like poles repel etc
exerts force on an another magnet.
magnetic field lines….how do the look? another word?
…draw…flux lines
magnetic field strength=
magnetic flux density
magn field strength is equivalent to
vector E
Lorentz law
charged particle moving in a mag field exp force.
force is propor to
charge, speed,component of mag field perp to its velocity.
Lorentz law …use
left hand rule.
x denotes the
cross product of the two vectors
a negative charge moving in one direction
is the same as a + charge moving in the opp direc
look at utube videos
do you understand?
