This week in the Ron Paul Curriculum physics course was an intro to the interplay between electricity and magnetism, and AC circuits.
Just as a magnetic field exerts a force on a current carrying wire, making it want to move, if we move a wire through a magnetic field, it creates an electric current. This is electromagnetic induction. Current is produced if you move the conductor or the magnetic field.
Magnetic field times the unit area perpendicular to the field.
Faraday’s low of induction:
If the flux through N loops of wire changes by an amount of delta Fee during a time of delta T the average emf is:
An induced emf always gives rise to a current whose magnetic field opposes the original change in flux.
Two ways to change flux:
- Change magnetic field
- Change the area that is perpendicular to it.
EMF induced in a moving conductor:
Changing magnetic flux produces an electric field:
- An electric field is induces in any region of space in which a magnetic field is changing with time.
- A magnetic field is induced in any region of space in which an electric field is changing with time.