Chapter 7
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Electric Field
surrounds an electric charge and exerts a force on other electric charges
magnetism
refers to the properties and interactions of magnets.
magnetic field
region of space that surrounds a magnet and exerts a force on other magnets and objects made of magnetic materials.
Magnetic fields can be represented with ___
magnetic field lines
magnetic poles.
regions of a magnet that exert the strongest force
N to N and S to S
Repel
N to S and S to N
attract
The magnetic field always points away from
north and towards south
which order is top and bottom
south at the top, north at the bottom
what can be made into a magnet
iron, cobalt, and nickel
What happens to the magnetic force as the distance between two magnetic poles decreases?
it increases
Atoms at the north pole of a magnet have
north and south magnetic poles.
Which metal cannot be attracted by a magnet?
aluminum
Which of these descriptions of magnetic force is not correct?
A south pole repels a north pole.
Which statement describes the magnetic field lines around Earth?
They point toward Earth’s south magnetic pole near its geographic north pole.
Electric current produces a
magnetic feild
The field’s direction depends on
the currents direction
electromagnetic force
the attractive or repulsive force between electric charges and magnets
electromagnetism.
interaction between electric charges and magnets
solenoid.
single wire wrapped into a cylindrical wire coil
electromagnet
temporary magnet created when there is a current in a wire coil.
electric motor
device that changes electrical energy into mechanical energy.
What is the purpose of the iron core in an electromagnet?
It increases the magnetic field in the coil.
What happens to an electromagnet when it is placed in a magnetic field?
It rotates to align with the field.