Chapter 15 Flashcards
Poles of a magnet
The poles of a magnet are where the magnetic forces are the strongest.
When magnets are brought together they exert a force on each other: poles repel, opposites attract.
Attraction and repulsion are examples of…
Non-contact forces.
A permanent makes its own ________ field.
Magnetic
Induced magnets is a material that…
only becomes magnetic when placed in a magnetic field.
Induced magnetism
Always causes a force of attraction. Induced magnets lose their magnetism when taken out of a magnetic field.
4 magnetic materials
Iron, nickel, steel and cobalt.
Region around a magnet
where a force acts on another magnet or a magnetic material is called the magnetic field.
The force is _____ the _____ it is to the magnet.
The force is STRONGER the CLOSER it is to the magnet.
Direction of a magnet
The direction of a magnetic field line is always from the north pole to the south seeking pole.
Magnetic compass
The compass needle points in the direction of the Earth’s magnetic field.
The motor effect
When a current move through a wire, a magnetic field is produced. If you INCREASE the current you INCREASE THE STRENGTH of the field.
The CLOSER an object is to the wire the GREATER the field strength.
MOTOR EFFECT: Rolling the wire into a solenoid…
INCREASES the field strength.
The field is strong and uniform within the solenoid.
