Unit 12- Magnetism and Electromagnetism

Magnetic Fields

A vector field created by moving charge.

Determines the magnitude and direction of the magnetic force on a charged object moving through that field. The direction of the magnetic force is determined by the right-hand rule

Magnetic Permeability, μ

Determines how great of a magnetic field an object will develop when placed in an external field.

Magnetic Flux

The product of the perpendicular component of the magnetic field to a surface area and the area that it is passing through.

Motional EMF

The motion of a conductor through a magnetic field can create an electromotive force, called the motional emf. This happens if the magnetic flux is changing.

Weber

The SI unit for magnetic flux, the Tesla meter², is called a Weber (abbreviated Wb)

Faraday’s Law of Electromagnetic Induction

States that the magnitude of the emf induced in a circuit is equal to the rate of change of the magnetic flux through the circuit.

Lenz’s Law

States that the direction of the current induced by an emf will always create a magnetic field opposite of the change in magnetic flux that created the emf.