Magnetism And Electromagnets Flashcards
(5 cards)
1
Q
What are the properties of magnetically hard materials
A
They can retain their magnetism and they can resist external magnetic fields
2
Q
What are the properties of magnetically soft materials
A
They allow magnetic flux lines to pass through them
They are easily demagnetised
The magnetic properties of the material change rapidly
3
Q
What is a magnetic field line
A
It represents the direction and strength of a magnetic field
4
Q
What does an electric current in a conductor produce?
A
It produces a magnetic field round it
5
Q
Describe the construction of electromagnets
A
It’s constructed by wrapping a coil of wire around a ferromagnetic core and passing an electric current through the wire. The current then makes a magnetic field turning it into a magnet
