Electromagnetic

Question 1

Define magnetic flux

Answer 1

a measurement of the total magnetic field that passes through a given area; a measure of the number of magnetic field lines passing through the given area

Question 2

Define magnetic flux density

Answer 2

the strength of a magnetic field or the number of magnetic field lines per unit area

Question 3

Define electromagnetic induction

Answer 3

the production of an electromotive force (EMF) or voltage across an electrical conductor due to its dynamic interaction with a magnetic field

Question 4

Define electromotive force (EMF)

Answer 4

a difference in potential that tends to give rise to an electric current, also written as emf

Question 5

Recall Faraday’s Law

Answer 5

a law stating that when the magnetic flux linking a circuit changes, an electromotive force (emf) is induced in the circuit proportional to the rate of change of the flux linkage

Question 6

Recall Lenz’s Law

Answer 6

states that the direction of an induced electric current always opposes the change in the circuit or the magnetic field that produces it

Question 7

Define electromagnetic radiation

Answer 7

radiant energy consisting of synchronised oscillations of electric and magnetic fields, or electromagnetic waves, propagated at the speed of light in a vacuum