Relationship between electricity and magnetism Flashcards
What is magnetic flux?
Magnetic flux refers to the amount of magnetic field that passes through a given area.
What is the unit for magnetic flux?
Weber (Wb)
What is the magnetic flux dependent on?
Strength of the field (density of the field lines) as well as the magnitude of the area.
FLUX = BA
What is the magnetic flux through an angled area?
To define the direction of area, we use an area vector. This vector with a magnitude is equal to the are and direction perpendicular to the surface of the area
When the area vector is parallel with the magnetic field,
the magnetic flux is maximum
However, if the area is rotated, so that the area vector is at an angle, theta,
the magnetic flux decreases
If the area vector is perpendicular to the magnetic field,
the magnetic flux is zero.
What is the formula for magnetic flux?
Flux = B (parallel) * A or BAcos(theta)
What is Faraday’s law?
Faraday’s law states that the induced emf (electromotive force) in a circuit is equal in magnitude to the rate at which the magnetic flux through the circuit is changing with time
How is electricity generated?
Electricity can be generated with magnetic fields. A changing magnetic flux will induce a current in a conductor.
What is Lenz’s law?
Lenz’s Law states that an induced emf always gives rise to a current that creates a magnetic field that opposes the original change in magnetic flux through the circuit.
What do both laws need to abide to?
Law of Conversation of Energy
