magnetism and electromagnetism Flashcards

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1
Q

what surrounds a magnet

A

a magnetic field

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2
Q

Describe the two outcomes of when 2 magnets are placed near each other.

A

They either attract or repel.

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3
Q

Describe where the magnetic force is the strongest.

A

Near the poles of the magnet.

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4
Q

Describe what permanent magnets are.

A

Permanent magnets are always magnetic.

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5
Q

Describe what induced magnets are.

A

Induced magnets are not always magnetic, most of the time they are unmagnetised.

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6
Q

Describe how an induced magnet is made.

A

When the material is placed inside another magnet’s magnetic field, it acts like a magnet and attracts magnetic materials.

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7
Q

Electromagnets

A

are temporary magnets produced by an electric current.

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8
Q

A simple electromagnet

A

solenoid wound round an iron core.

When current passes through it, it magnetises the iron core.

It can be switched on and off because it is a temporary (induced) magnet.

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9
Q

Describe what happens to a wire when current flows through the wire.

A

The current creates a magnetic field around a wire.

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