Download Unit 9: Magnetism and Induction Review KEY

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Unit 9: Magnetism and Induction Review
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V2 N2
1.
What is a magnet? What causes magnetism?
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2.
A magnet is any material capable of producing its own magnetic fields.
Magnetism is caused by the spin of electrons in atoms
Which magnetic pole interactions repel? Which attract?
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North –North and South-South interactions repel, while North-South
interactions attract.
3.
Draw the magnetic field around the horseshoe and bar magnets below.
4.
Where around a magnet is the magnetic field the strongest?
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5.
How can you build an electromagnet? What are two ways to increase the strength of an
electromagnet?
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6.
The North Pole is at the bottom “head” of the nail. The poles can
be reversed by changing the direction of current flow.
What did Ørsted discover in his famous experiment? What two
properties of matter did he link?
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8.
An electromagnet can be built by wrapping a current-carrying wire around an
iron core. Strength can be increased with more current or more turns of wire.
Use the right-hand rule to label the north and South Pole on the magnet.
How can the poles be reversed?
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7.
The magnetic field is strongest nearest to the magnet and on the magnet itself.
Ørsted discovered that current flowing through a magnet
deflected a compass needle. He related the concepts of electricity and magnetism
How can wires make a magnetic field? What determines the direction of the field?
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Wires make a magnetic field when current flows through them. The direction of
the field is determined by the direction of current flow.