magnets unit test Flashcards
A magnet attracts metals made of…
iron
Magnets can be found in…
jewelry, phones, doorbell, computer, credit cards, or toys.
When two objects PULL together with force…
They attract
When two objects PUSH away from each other with force…
They Repel
When a magnet is broken in half…
each half will automatically gain a new pole.
Magnetic forces are formed from the gain or loss of…
electrons
The strength of a magnet can be determined by its…
size, how close it is to the object, or the material from which it is made.
Magnetic field lines show BOTH…
the direction and strength of the magnet.
Magnets can in fact become demagnetized. However, if the temperature of the magnet is decreased…
it will remain magnetized.
A magnet is attracted to…
Nickel, iron, and cobalt
The closer together the lines in a magnetic field…
the stronger the field
The lines around a magnet are closest together at _______ where the magnetic force is strongest
the poles
Field lines that are close together on either of the poles show that…
the magnet has a strong magnetic field.
A compass lines up with…
the Earth’s magnetic field.
An Electromagnet is…
a current carrying wire wrapped around an iron core
The strength of the magnetic field of a coiled wire _____ as more loops are used and as the current in the wire is increased.
Increased
Since an electric current can produce a magnetic field…
electricity can be used to make a magnet.
Electromagnets attract things only when _____ exists in the wire
a current
electromagnets can be…
turned on and off as needed
