Define the term magnet.
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Define the term magnet.
Magnets are objects with north and south poles. They attract magnetic materials and can attract or repel other magnets.
Name the two poles of a magnet.
The two poles of a magnet are the north and south poles.
True or False?
Opposite poles attract.
True.
Opposite poles attract.
Define the meaning of the phrase like poles.
Like poles have the same polarity (e.g. north and north) and they repel each other.
Define the meaning of the phrase unlike poles.
Unlike poles have opposite polarities (e.g. north and south) and attract each other.
What does it mean for a material to be magnetic?
A magnetic material experiences an attractive force when placed in a magnetic field and can be magnetised to form a magnet.
State the meaning of the term non-magnetic material.
Non-magnetic materials do not experience a force when placed in a magnetic field.
True or False?
Only a magnet can repel another magnet.
True.
Only a magnet can repel another magnet.
What is the test for a magnet?
To test whether a material is a magnet, it should be brought close to a known magnet. If it can be repelled by the known magnet, then the material itself is a magnet.
True or False?
The south pole of one magnet repels the north pole of another magnet.
False.
Opposite poles attract.
Define the term permanent magnet.
Permanent magnets produce their own magnetic field and do not lose their magnetism.
What is induced magnetism?
Induced magnetism is when a magnetic material is placed in a magnetic field and the material can temporarily be turned into a magnet.
Define the term magnetic material.
Magnetic materials are materials that are attracted to a magnet.
True or False?
Induced magnets retain their magnetism after being removed from the magnetic field.
False.
Induced magnets lose most/all of their magnetism quickly after being removed from the magnetic field.
What happens to the ends of a magnetic material when it becomes an induced magnet?
When magnetism is induced in a material, one end of the material will become a north pole, and the other end will become a south pole.
True or False?
Aluminium is a magnetic material.
False.
Aluminium is not a magnetic material.
What is an example of a magnetic material?
Iron, cobalt, nickel, and steel (an alloy containing iron) are examples of magnetic materials.
How can you determine which pole is induced at a particular end of a magnetic material?
To determine which pole is induced at one end of a magnetic material, hold a south pole near that end. If the end is repelled, it is a south pole. If it attracts, it is a north pole.
What is an example of a non-magnetic material?
Any material other than iron, cobalt, nickel, and steel (or alloys containing these metals) is a non-magnetic material. For example, aluminum, copper, wood, plastic, etc.
True or False?
The south pole of an induced magnet will repel an iron paperclip.
False.
The iron paperclip, a magnetic material, can only be attracted by a magnet, not repelled.
Define the term magnetic field.
A magnetic field is the region around a magnet where a force acts on another magnet or on a magnetic material.
Define the term uniform magnetic field.
A uniform magnetic field is a magnetic field that has the same strength and direction at all points.
How is a uniform magnetic field represented in diagrams?
In a uniform magnetic field, the magnetic field lines are equally spaced, and all arrows point in the same direction.
What are magnetic field lines?
Magnetic field lines are lines drawn to represent the strength and direction of a magnetic field.
What are the two rules for drawing magnetic field lines?
Two rules for drawing magnetic field lines are:
Magnetic field lines must always go from north to south (indicated by an arrow midway along the line)
Field lines must never touch or cross other field lines
True or False?
The magnetic field is strongest at the poles of a bar magnet.
True.
The magnetic field is strongest at the poles of a bar magnet, where the magnetic field lines are closest together.
What do closely spaced magnetic field lines indicate? (Extended Tier Only)
Closely spaced magnetic field lines indicate a strong magnetic field.
What do widely spaced magnetic field lines indicate? (Extended Tier Only)
Widely spaced magnetic field lines indicate a weak magnetic field.
What causes magnetic forces? (Extended Tier Only)
Magnetic forces are caused by interactions between magnetic fields.
The magnetic field of a bar magnet gets weaker further from the magnet. How is this represented in a diagram? (Extended Tier Only)
To represent the fact that a bar magnet's field weakens with distance from the magnet, the field lines get further apart further from the bar magnet.
What are the two principal ways of plotting the magnetic field around a bar magnet?
The two principal ways of plotting the magnetic field around a bar magnet are using iron filings and using plotting compasses.
What is the method for plotting magnetic field lines using iron filings?
To plot magnetic field lines using iron filings:
Place a piece of paper on top of the magnet
Gently sprinkle iron filings on top of the paper
Carefully tap the paper to allow the iron filings to settle on the field lines
What is the method for plotting magnetic field lines using a plotting compass?
To plot magnetic field lines using a plotting compass:
Place the magnet on top of a piece of paper and draw a dot at one end
Place a plotting compass next to the dot so that one end of the needle points towards the dot
Draw a new dot at the other side of the compass needle
Move the compass to point towards the new dot
Repeat the process to create a chain of dots representing the magnetic field line
True or False?
The direction of the magnetic field line plotted using a compass is the same as the direction of the plotting compass.
True.
The direction of the magnetic field line plotted using a compass is the same as the direction of the plotting compass.
What do you need to do after creating a chain of dots using a plotting compass?
After creating a chain of dots using a plotting compass, you need to remove the compass and link the dots using a smooth curve to represent the magnetic field line.
How can you plot multiple magnetic field lines around a bar magnet?
To plot multiple magnetic field lines around a bar magnet, you need to repeat the process of using the plotting compass several times, starting from different points on the magnet.
True or False?
The compass needle points in the opposite direction to the arrows on the field lines.
False.
The needle points in the same direction as the arrows on the field lines.
True or False?
In the iron filing experiment, more filings will gather near the magnet's poles than at the edge of the paper.
True.
The magnetic field is stronger at the magnet's poles, so more iron filings will gather here.