magnets + electromagnets

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Last updated 10:27 PM on 6/9/26
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15 Terms

1
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what are the rules of attraction and repulsion?

  • opposite charges attract

  • like charges repel

2
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what is a permanent magnet?

something that is always magnetic, therefore has its own magnetic poles

3
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what is an induced magnet?

something that is only magnetic when placed in a magnetic field, therefore doesn’t have its own magnetic poles

4
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which metals are magnetic?

  1. iron

  2. nickel

  3. cobalt

5
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what direction do magnetic field lines point?

north to south

6
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where is the magnetic force the strongest?

closest to the pole

7
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what is a plotting compass?

a small compass which shows the direction of the magnetic field

8
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the earth’s core is magnetic - true or false?

true

9
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what is the relation between current and magnetism?

current produces a magnetic field around a wire

10
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how do we know the direction of a magnetic field around a current carrying wire?

right hand rule

11
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right hand rule picture here

12
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what determines the strength of a magnetic field?

  • greater current

  • closer distance

13
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what is a solenoid?

a coil of wire that generates a magnetic field when electrical current flows through it

14
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what is the magnetic field of a solenoid?

picture

15
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how can we increase the magnetic field of a solenoid?

  • adding a iron core in the centre

  • size of the current

  • length

  • cross sectional area

  • number of coils