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Physics > Magnetism > Flashcards

Magnetism Flashcards

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1
Q

Define magnetism

A

The ability for a object to become a magnet

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2
Q

Name the 4 materials that are naturally magnetic

A

Iron
Cobalt
Nickle
Steel

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3
Q

How can we if a material is magnetic

A

If ht object is attracted to a magnet

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4
Q

What are Domains ?

A

A magnetic domain is a region within a magnetic material in which the magnetisation is in a uniform direction.

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5
Q

What is a bar magnet ?

A

Bar magnets are permanent magnets. This means that their magnetism is there all the time and cannot be turned on or off.

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6
Q

What are the names of the two poles on a magnet ?

A

North and South

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7
Q

What happens to a magnet when you put two north poles together ?

A

They repel

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8
Q

What happens when you put a South pole and North pole together ?

A

They attract

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9
Q

Define induced magnetism

A

The process by which a substance, such as iron or steel, becomes magnetised by a magnetic field

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10
Q

Define electromagnetism

A

Creating a magnet using electricity

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11
Q

Why are electromagnets useful ?

A

They can be turned on off

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12
Q

What is repulsion ?

A

Repulsion is the test for a magnet because unmagnetised iron will be attracted to another magnet but it will not be repelled.

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13
Q

What are the units of power

A

Watts

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14
Q

What is a ferrous alloy ?

A

An alloy that contains iron

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15
Q

Where is the strongest magnetic field around a bar magnet?

A

The strongest fields are found around the poles of a bar magnet.

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16
Q

What is the name given to the attraction of unmagnetised iron to a magnet?

A

The attraction of unmagnetised iron to a magnet is called induced magnetism.

17
Q

What is another term for substances that can only be temporarily magnetised?

A

Substances that can only be temporarily magnetised are called soft

18
Q

Specifically in which direction do the lines run in a field diagram?

A

The lines run from north to south in a field diagram.

19
Q

What happens to the magnetic field around an electromagnet when the current is reversed?

A

When the current surrounding an electromagnet is reversed the current also reverses

20
Q

What do field line patterns show?

A

Field line patterns show both the direction and shape of a magnetic field.

Physics (9 decks)

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