Magnetism (Edexcel GCSE Combined Science: Physics): Flashcards
Exam code: 1SC0
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Define poles.
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Cards in this collection (25)
Define poles.
The poles are the two ends of a magnet.
What are the two poles of a magnet called?
A north pole and a south pole.
State the law of magnetism.
Like poles (N-N or S-S) repel each other, and unlike poles (N-S) attract each other.
The attraction or repulsion between two magnetic poles is an example of a ______ force.
The attraction or repulsion between two magnetic poles is an example of a non-contact force.
True or False?
Two south poles held close together will attract each other.
False.
Two like poles (S and S) repel each other; only unlike poles attract.
Name three metals that are magnetic materials.
Iron, cobalt and nickel (steel is also magnetic as it is an alloy containing iron).
Define induced magnetism.
Induced magnetism is the temporary magnetism gained by a magnetic material when it is placed in a magnetic field.
How can you test whether an object is a magnet or just a magnetic material?
Bring a known magnet close to it: if the object is repelled, it is itself a magnet; if it is only attracted, it is a magnetic material.
When an induced magnet is removed from a magnetic field, it ______ most or all of its magnetism quickly.
When an induced magnet is removed from a magnetic field, it loses most or all of its magnetism quickly.
True or False?
A magnetic material is only attracted to a magnet if a specific pole is held close to it.
False.
Magnetic materials are attracted to a magnet regardless of which pole is held close to them.
When magnetism is induced in a material, what pole forms at the end nearest the magnet?
The end nearest the magnet forms the pole opposite to the magnet's nearest pole, since opposite poles attract.
Define a permanent magnet.
A permanent magnet produces its own magnetic field and does not lose its magnetism.
Define a magnetic field.
A magnetic field is the region around a magnet where a force acts on another magnet or on a magnetic material.
In which direction do magnetic field lines point?
From the north pole to the south pole.
Magnetic field lines that are close together show a ______ field, while lines that are far apart show a ______ field.
Magnetic field lines that are close together show a strong field, while lines that are far apart show a weak field.
True or False?
Magnetic field lines can touch or cross each other.
False.
Magnetic field lines must never touch or cross other field lines.
Define a uniform magnetic field.
A uniform magnetic field has the same strength and direction at all points, shown by equally spaced, parallel field lines.
Where is a uniform magnetic field produced?
In the gap between two opposite poles held close together.
Where is the magnetic field around a bar magnet strongest, and why?
At the poles, because the magnetic field lines are closest together there.
What does the arrow on a plotting compass represent when investigating a magnetic field?
The arrow represents the compass's north pole, showing the direction of the magnetic field at that point.
What evidence suggests that the Earth's core is magnetic?
A magnetic compass, in the absence of any other magnet, always points north, showing the Earth has its own magnetic field.
The Earth's magnetic field is similar to the field produced by which object?
A bar magnet.
True or False?
The geographic North Pole is a magnetic north pole.
False.
The geographic North Pole is actually a magnetic south pole.
Explain why the north pole of a compass is attracted towards the geographic North Pole.
The geographic North Pole is a magnetic south pole, and unlike poles attract, so the compass's north pole is drawn towards it.
The geographic South Pole is a magnetic ______ pole, which repels the north pole of a compass.
The geographic South Pole is a magnetic north pole, which repels the north pole of a compass.
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