Magnetism And Electromagnetism Flashcards
What are the poles of magnets ?
Where the magnetic forces are strongest
What happens when 2 Magnets are brought close to each other ?
exert a force on each other
What do 2 like poles do ?
Repel each-other
What do 2 unlike poles do ?
Attract each-other
Magnetic force is a —- ————- force ?
Non contact
What does a permanent magnet do ?
Produce its own magnetic field
What does an induced magnet do ?
becomes a magnet when it is placed in a magnetic field
What does an induced magnet always do ?
causes a force of attraction
When an induced magnet is removed from the magnetic field what happens ?
loses most/all of its magnetism quickly
What is the region around a magnet where a force acts on another magnet or on a magnetic material ?
Magnetic field
What is the force between a magnet and a magnetic material ?
Attraction
What does the strength of a magnetic field depend on ?
depends on the distance from the magnet
Where is the magnetic field strongest ?
The poles
What is the direction of the magnetic field line ?
North Pole ——> South Pole
What does a magnetic field compass contain ?
A small bar magnet
In what direction does the compass needle point ?
In the direction of earths magnetic field
What happens when a current flows through conducting wire?
A magnetic field is produced around the wire
What does the strength of the magnetic field depend on?
current through the wire
distance from the wire
What happens to the strength of magnetic field when you shape a wire to form a solenoid?
It increases
What is the magnetic field like inside a solenoid?
Strong and uniform
What Would increase the strength of the magnetic field of a solenoid?
An iron core
What is an electromagnet?
A solenoid with an iron core
What is the motor effect?
When a conductor carrying a current is placed in the magnetic field the magnet producing a field and the conductor exert a force on each other
What is the basis of an electric motor?
A coil of wire carrying a current in a magnetic field that rotates
