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Abi Science 2017 > Magnetism > Flashcards

Magnetism Flashcards

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1
Q

What is a magnet?

A

An object which has opposite magnetic poles at the end

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2
Q

What happens if a magnet is broken in half?

A

It breaks into two magnets

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3
Q

What is a permanent magnet?

A

A magnet which retains its magnetism

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4
Q

What is a temporary magnet?

A

The opposite of a permanent magnet

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5
Q

What is an example of a permanent magnet?

A

A bar magnet

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6
Q

What is an example of a temporary magnet?

A

Electromagnets

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7
Q

What is a magnetic field?

A

A region in space in which a magnet or ferromagnetic material will experience a force which is magnetic in nature

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8
Q

What does the strength and direction of a magnetic force depend on?

A

The magnetic object’s position in relation to the magnet

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9
Q

Which side of a magnet is a compass needle attracted to?

A

South

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10
Q

What are field lines?

A

Lines that show the direction of the force that an iron filing would experience at a particular point in the field

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11
Q

How do magnets react with one another?

A

Like poles repel

Unlike poles attract

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12
Q

Why does a compass needle point north?

A

It is responding to the magnetic field that the earth has

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13
Q

What is magnetic declination?

A

The angle between magnetic north and geographic north

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14
Q

What is another name for geographic north?

A

True north

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15
Q

Why are magnetic north and true north different?

A

The earth is tilted

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16
Q

What causes aurora borealis?

A

CMEs and the earth’s magnetic fields

17
Q

What does CME stand for?

A

Coronal mass ejection

18
Q

What is a CME?

A

A cloud of gas released by solar activity

19
Q

What happens when a CME reaches earth?

A

It collides with the earth’s magnetic field

Charged particles are generated

20
Q

How is auroral light created?

A

The charged particles from the CME ionise the Nitrogen and oxygen in the air, which radiate light

21
Q

Why does auroral light appear at the poles?

A

The charged particles spiral along the magnetic field lines

22
Q

What is a magnetic storm?

A

Massive disturbances in the magnetosphere caused by collision with solar winds and the magnetosphere

Abi Science 2017 (18 decks)

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