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paper 2
electromagnetism
magnetic fields
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Created by
Millie Beckett
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Cards (22)
What is a magnetic field?
Region
around
a
magnet
where
force
acts
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How do you plot the magnetic field pattern of a magnet?
Using a
compass
to draw field lines
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What are the two types of magnets mentioned?
Permanent
and
induced
magnets
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What is a permanent magnet?
Always has a
magnetic field
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What is an induced magnet?
Becomes a magnet in a
magnetic field
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What are the four types of magnetic materials?
Iron
,
steel
, cobalt,
nickel
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What happens when a magnetic material is placed in a magnetic field?
It experiences a
force of attraction
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How does the strength of a magnetic field change with distance?
It
decreases
as distance
increases
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Where is the magnetic field strongest in a magnet?
At the
poles
of the magnet
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How can you find the direction of a magnetic field?
Using a
magnetic compass
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What does a compass needle indicate when placed near a magnet?
The direction of the
magnetic field
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What is the first step in plotting a magnetic field using a compass?
Place the compass near the
North Pole
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What do you do after marking the compass position?
Move the compass and draw another
cross
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What does it mean when field lines are closer together?
The
magnetic field
is stronger
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What does the Earth's magnetic field indicate?
That the
Earth
has its own
magnetic field
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What causes the Earth's magnetic field?
The
Earth's core
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What happens to a compass needle when held away from magnets?
It points in the
north-south direction
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What are the steps to plot a magnetic field using a compass?
Place the compass near the
North Pole
of the magnet.
Draw a cross at the North Pole of the compass.
Move the compass so the
South Pole
is on the cross.
Draw another cross at the North Pole of the compass.
Repeat until the field is fully plotted.
Connect the dots with a line and add arrows.
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What are the characteristics of permanent and induced magnets?
Permanent magnets:
Always have a
magnetic field
Induced magnets:
Become magnets in a magnetic field
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What are the properties of magnetic materials?
Types of magnetic materials:
Iron
Steel
(an alloy of iron)
Cobalt
Nickel
Can be
permanent
or
induced
magnets
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What is the relationship between distance and magnetic field strength?
Magnetic field strength decreases with distance
Strongest at the
poles
of the magnet
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How does a compass work in relation to magnetic fields?
Contains a small
bar magnet
Indicates the direction of the magnetic field
Used to plot
magnetic field lines
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