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forces gravity carts > magnetism > Flashcards

magnetism Flashcards

1
Q

What are the 2 ends of a bar magnet called?

A

south pole and north pole

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2
Q

name two magnetic materials

A

iron and cobalt

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3
Q

What happens if you arrange 2 magnets with their north poles close to each
other?

A

they repel

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4
Q

How can you arrange 2 magnets so they attract each other?

A

place the opposite poles close together

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5
Q

What is a magnetic field?

A

The area around a magnet where magnetic objects feel a force

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6
Q

How can you find the shape of a magnetic field?

A

Use iron filings or plotting compasses

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7
Q

Name 2 electrical devices that use magnets.

A

generators and loudspeakers

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8
Q

why do compasses point north?

A

It’s in the earths magnetic field

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9
Q

Describe the shape of the Earth’s magnetic field.

A

Similar to the field around a bar magnet

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10
Q

Why are compass needles weighted at one end?

A

In most places the Earth’s magnetic field is not parallel to the surface

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11
Q

Which part of the Earth is responsible for its magnetic field?

A

the outer core

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12
Q

What is the difference between the North Pole and the north magnetic pole of the Earth?

A

earth spins around the north pole, compasses point to the magnetic north

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13
Q

What is an induced magnet?

A

an object that only turns into a magnet when it’s in a magnetic field if another magnet

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14
Q

Which way does a plotting compass’ needle point when being used to plot the magnetic field around a bar magnet

A

towards south
away from north

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15
Q

How does a magnetic field diagram show where the field is strongest?

A

where the lines are closest together

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16
Q

What is a uniform magnetic field?

A

A magnetic field with the same strength everywhere

17
Q

how can you produce a uniform magnetic field?

A

using two flat magnets

18
Q

What shape is the magnetic field around a wire with a current flowing through
it?

A

circular around the wire

19
Q

What is an electromagnet?

A

a magnet made when current flows through a coil of wire

20
Q

How can you create a magnetic field around a wire?

A

pass a current through it

21
Q

Where is the magnetic field around a wire strongest?

A

closest to the wire

22
Q

How can you increase the strength of the magnetic field around a wire?

A

increase the current

23
Q

How can you change the direction of the magnetic field around the wire?

A

reverse the current

24
Q

What is a solenoid?

A

A coil of wire with a current flowing in it / Another name for an electromagnet

25
Q

Why is an electromagnet called a temporary magnet?

A

It’s only magnetic when a current is flowing: you can turn it off!

26
Q

Describe the magnetic field inside a solenoid.

A

Strongest place, uniform, goes along the centre of the coil

27
Q

Why is the magnetic field of a solenoid stronger along the middle than outside it?

A

The field from the two halves of the coil reinforce each other in the middle and oppose each other outside.

28
Q

Describe the magnetic field between two flat magnets.

A

uniform

29
Q

What is the motor effect?

A

A force produced when a current flows inside a magnetic field

30
Q

How can we MAKE a magnetic field that can be turned on and off (temporary magnet)?

A

flow a current through a wire

31
Q

In terms of poles, which way does a magnetic field go?

A

n to s

32
Q

What is the name of the effect of a wire feeling a force if it has a current in it and it is in a magnetic field?

A

the motor effect

33
Q

How is the wire with the current arranged compared to the magnetic field for it to feel the greatest force?

A

at right angles

34
Q

What connects the motor to the external circuit?

A

split ring commutator

35
Q

What are on the ends of the wires that touch this?

A

carbon brushes

36
Q

Give 2 ways of increasing the strength of the motor effect.

A

increase current
increase strength of magnetic field

37
Q

What does magnetic flux density measure?

A

strength of magnetic field

38
Q

What are the units of magnetic flux density?

A

tesla

39
Q

What happens when you move a wire in a magnetic field?

A

a current or voltage induced in the wire

forces gravity carts (9 decks)

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