Magnetism And Electromagnetism Flashcards
What does a coil of wire carry
a current in a magnetic field that tends to rotate
What happens when two magnets are brought close together
The exert a force on each other (poles that are a like repel and poles that are unlike attract each other)
Give some examples of noncontact force
Attraction and repulsion between two magnetic poles
What does a permanent magnets produce
It’s own magnetic field
What is an induced magnet
Is a material that becomes a magnet when it is placed in a magnetic field
What does induced magnetism always cause
A force of attraction (when remove the magnetic field an induced magnet loses most of its magnetism quickly)
What is magnetic field
When the region around the magnet where a force acts on another magnet or on a magnet material (like Iron, steel, cobalt and nickel)
What does the strength of a magnetic field depend on
The distance from (the magnets the field is strongest at the poles of the magnet)
What does a magnetic compass contain
A small bar magnet
The Earth has a magnetic field and what happens to the compasses needle
It’s points in the direction of the earths magnetic field
What happens when a current flows through the conducting wire
A magnetic field is produced around the wire (the strength of the magnetic field depends on the current through the wire and the distance from the wire)
What are the bases of an electric motor
A coil of wire caring a current in a magnetic field tends to rotate
What’s the difference between permanent and induced magnets
Permanent always have their magnetism
Induced are made as a magnet but when the magnet is removed they could lose all or most of their magnetism
How does the direction of a magnet run
Always from the north pole to the South Pole
What is the earths magnetic field due to
The earths core
