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Physics paper 2
Magnetism
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Created by
Emilia Hala
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Cards (24)
Name three magnetic materials
iron
,
nickel
,
cobalt
What happens when unlike poles are brought together?
They
attract
What happens when like poles are bought back together?
They
repel
What is a
magnetic field
?
The
area
of magnetic force around a magnet in which a magnetic material would
experience a force
Where is the magnetic field the strongest?
At the
poles
Where is the magnetic field the weakest?
middle
What happens to the strength of the magnetic field as you get further away from the magnet?
It gets weaker (It gets stronger the closer you are to it)
What does the distance between magnetic field lines tell us?
The
strength
of the magnetic field;
closer
the lines, the stronger the field
In which direction do magnetic field lines always point?
From
north
to
south
What is a
permanent magnet
?
A
material
that always has its own
magnetic field
What is an induced magnet?
A material that becomes
magnetic
when it is placed in a
magnetic field
What does a compass contain?
A
bar
magnet
How can a compass be used to show a magnetic field?
Compass needle aligns with magnetic field (
north
needle points toward
south
pole
What causes Earth's magnetic field?
Outer core
What is produced around a wire when a current flows through it?
Magnetic field
How can you work out the direction of the magnetic field around a wire?
Right hand rule
There are three ways to increase the strength of the magnetic field around the wire. What are they?
1.Coil wire into
solenoid
(more coils, stronger field)
2.Add
iron core
(now called electromagnet)
3.Increase
current
Name two advantages of using electromagnets over permanent magnets
1.Can be
turned on
and
off
2.Strength of magnet can be
increased
/
decreased
What is the motor effect?(HT)
When a wire carrying a current is placed in a magnetic field and experiences a force
What causes the
motor
effect?(HT)
Interaction between magnetic field around the wire and the permanent magnetic field
How can you predict the direction of the force caused by motor effect?(HT)
Fleming's left hand rule
What is the function of the split ring commutator in a dc motor?(HT)
Keeps motor spinning in the same direction (by changing direction of current every half turn)
Name two ways you can you make a motor spin
faster
(HT)
1.Increase current
2.Increase strength of permanent magnetic field
How can you make a motor spin in the reverse direction?(HT)
1.reverse current
2.reverse direction of permanent magnetic field