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Physics > Magnetism > Flashcards

Magnetism Flashcards

1
Q

Permanent magnets

A

No matter how many times we cut a magnet into smaller pieces, we will never be able to get only a north Pole or only a South Pole. Every piece of a magnet always has both poles

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2
Q

Magnetic field

A

Is a region of space where a magnet or a ferromagnetic material will experience a force

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3
Q

What do we use magnetic field lines for

A

To represent a magnetic field

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4
Q

What dimension is a field line

A

It Is a 3 dimensional space around a magnetic, we normally draw them in two dimensions

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5
Q

Closer to the magnet

A

Draw lines close together

Magnetic field is large

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6
Q

Further away from the magnet

A

Further apart

Magnetic field line is smaller

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7
Q

What causes a magnetic field line

A

Whenever a charge moves, it produces s magnetic field line

All magnetic fields are the result of moving charges even if on a microscopic level

The magnetic field is caused by an electron moving in circle points at right angles to the circle

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8
Q

Why is there no resultant magnetic field

A

The magnetic fields are created by individual electrons pointing in all different directions

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9
Q

Ferromagnetic materials

A

Materials that are strongly attracted by magnets and are easily magnetised

Examples
Iron
Cobalt
Nickel and their alloys

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10
Q

Non contact force

A

A force exerted on an object without touching the object

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11
Q

Compare magnetic field with electric field and gravitational field

A

An electric field is a region in space where an electric charge will experience an electric force. A gravitational field is a region in space where a mass will experience a gravitational force

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12
Q

What is a magnet

A

An object that has a pair of opposite poles, called North and South

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13
Q

Why do like magnetic poles repel and opposite poles attract

A

To predict the behavior of magnets when they are brought close together

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14
Q

Properties of magnetic field lines

A

The more closely spaced the field lines are at a point the greater the field at that point

Arrows drawn on the field lines indicate the direction of the field

The direction of a magnetic field points from North to the South Pole

Magnetic field lines never cross

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15
Q

What will happen of a ferromagnetic material is placed in a magnetic field

A

The domains that have a magnetic field parallel to the external field will grow and the other ones will shrink

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16
Q

What will happen is a ferromagnetic material is places in a very strong magnetic field

A

The domains will rotate so that they are parallel to the external field

17
Q

Geographic North Pole

A

Point in the northern hemisphere where the rotation axis of the Earth meets the surface

18
Q

Magnetic North Pole

A

The point where the magnetic field lines of the Earth enters the Earth. It is the direction in which the North Pole of a compass points

19
Q

Magnetic South Pole

A

The point where the magnetic field lines of the Earth leaves the Earth

20
Q

Examples of phenomena that are affected by Earth’s magnetic field

A

Aurora Borealis (Nothern Lights) and magnetic storms

21
Q

Aurora Borealis ( Northern Lights)

A

An atmospheric phenomenon consisting of bands of light at the North Pole caused by charged solar particles following the Earth’s magnetic lines of force

22
Q

Magnetic storm

A

A disturbance in the Earth’s outer magnetosphere, usually caused by streams of charged particles given off by solar flares

23
Q

Magnetosphere

A

A region surrounding the Earth in which charged particles are trapped and their behavior is dominated by the Earth’s magnetic field

24
Q

Solar wind

A

A stream of radioactive and charged particles sent into space at high speeds due to reactions on the sun

25
Q

Si unit for magnetic inductivity

A

Tesla

26
Q

What defines the geographic poles

A

The rotation of the Earth

They are the two points on earth that do not experience sunrise and sunset

27
Q

What is the magnetic field caused by

A

It is caused by charges moving inside the liquid core of the Earth

28
Q

Why is the magnetosphere important

A

Because it deflects most of the solar wind. Without this protection, telecommunications devices would be destroyed and living things would experience many harmful effects

Physics (9 decks)

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