Electromagnetism Flashcards
1
Q
Magnetism
A
Movement of electric charges.
2
Q
Permanent magnets
A
Have two poles located at opposite ends of the magnet - North and South pole.
3
Q
Magnetic flux density
A
The force acting on 1m of a conductor carrying a current of 1A perpendicular to the direction of the magnetic field.
4
Q
Unit of magnetic flux density
A
T - tesla (a vector quantity)
5
Q
Lenz’s law
A
The inducted emf makes a current to flow in such a direction as to oppose the change that caused it.
6
Q
Faraday’s law
A
If the magnetic flux lines passing through a circuit change then an emf is induced. The induced emf is proportional to the rate of change of magnetic flux passing through the circuit.
7
Q
Electromagnetic induction
A
When a change in magnetic flux induces an emf.
