it is impossible to separate positive and negative north and south poles
Materials that exhibit strong magnetic effects are called ferromagnetic
Electromagnetism is the use of electric current to make magnets
Magnetic monopoles have never been observed
Magnetic monopoles (MMs) are hypothetical fundamental particles that carry isolated magnetic charge
Units for magnetic field: Tesla (T)
The Hall effect is the production of a potential difference across an electrical conductor that is transverse to an electric current in the conductor and to an applied magnetic field perpendicular to the current
U0 - permeability of free space
Bio-Savart Law - magnetic field due to a current-carrying conductor at a distance point is inversely proportional to the square of the distance between the conductor and point, and the magnetic field is directly proportional to the length of the conductor, current flowing in the conductor
Solenoid - A long coil of wire with many turns
What effect is responsible in large circuit breakers for concentrating an arc between plates of a switch trying to break a large current, burn hones, or even ignite the equipment?
Pinch effect
Operational definition of an Ampere?
For parallel wires, separated by 1m with each carrying 1 A, the force per m is 2E-7 N/m
Official definition of an Ampere is - one ampere of current through each of 2 parallel conductors of infinite length, separated by 1m in empty space free of other magnetic fields, causes a force of exactly 2E-7 N/m on each conductor
