magnetism and electromagnetism (p2) Flashcards

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1
Q

How will like poles (north & north or south & south) behave when they interact?

A

They will repel and push away from each other

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2
Q

How will opposite poles (north & south or south & north) behave when they interact?

A

They will attract and pull towards each other

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3
Q

Is the magnetic force a contact or a non-contact force?

A

Non-contact

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3
Q

On a magnet, where is the magnetic field strongest?

A

The magnetic field is strongest at the poles of a magnetic

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4
Q

What is a permanent magnet?

A

A magnet that produces its own magnetic field

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5
Q

What is an induced magnet?

A

A material that becomes magnetic when it is placed in a magnetic field

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6
Q

What is the difference between a permanent and an induced magnet?

A

A permanent magnet always has a magnetic field, but an induced magnet only becomes magnetic when it is placed into a magnetic field

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7
Q

What is a magnetic field?

A

The region of space where a magnetic force will act on a magnet or a magnetic material

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8
Q

What are the four types of magnetic material?

A

Iron, nickel, cobalt and steel

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9
Q

Is the force between a magnet and a magnetic material attractive or repulsive?

A

Attractive

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10
Q

What shape is the magnetic field around a bar magnet?

A

Many loops going from the North pole to the South pole

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11
Q

In which direction should magnetic field lines point?

A

Magnetic field lines point towards the south pole of the magnet

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12
Q

What is a magnetic compass?

A

A small bar magnet mounted on a pin so that it can spin around. It will point in the direction of a nearby magnetic field

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12
Q

What does the strength of a magnetic field depend on?

A

The strength of the magnet AND the distance from the magnet

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13
Q

Is the magnetic field around the Earth permanent or induced?

A

permanent

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14
Q

What is a solenoid?

A

A coil of current-carrying wire

15
Q

What is an electromagnet?

A

A solenoid (coil of current-carrying wire) with an iron core

16
Q

What is the shape of the magnetic field around a wire?

A

Circular field lines around the wire

17
Q

What is the shape of the magnetic field around an electromagnet?

A

Similar shape to the field around a bar magnet: many loops going from one end to the other end

18
Q

How can a magnetic field be produced around a metal wire?

A

When current flows through the wire

19
Q

What does the strength of a magnetic field around a wire depend on?

A

The size of the current in the wire AND the distance from the magnet

20
Q

[๐—›๐—ถ๐—ด๐—ต๐—ฒ๐—ฟ ๐—ง๐—ถ๐—ฒ๐—ฟ] What is the motor effect?

A

When a conductor carrying a current is placed in a magnetic field the magnet producing the field and the conductor exert a force on each other

21
Q

[๐—›๐—ถ๐—ด๐—ต๐—ฒ๐—ฟ ๐—ง๐—ถ๐—ฒ๐—ฟ] In Flemingโ€™s left hand rule, state what the thumb represents

A

Force (measured in Newtons, N)

22
Q

[๐—›๐—ถ๐—ด๐—ต๐—ฒ๐—ฟ ๐—ง๐—ถ๐—ฒ๐—ฟ] In Flemingโ€™s left hand rule, state what the first finger represents

A

Magnetic flux density (measured in Tesla, T)

23
Q

[๐—›๐—ถ๐—ด๐—ต๐—ฒ๐—ฟ ๐—ง๐—ถ๐—ฒ๐—ฟ] In Flemingโ€™s left hand rule, state what the middle finger represents

A

Current (measured in Amps, A)

24
Q

[๐—›๐—ถ๐—ด๐—ต๐—ฒ๐—ฟ ๐—ง๐—ถ๐—ฒ๐—ฟ] What affects the size of the force on the wire in the motor effect?

A

The size of the magnetic field, the size of the current in the conductor, the length of the conductor that is in the magnetic field

25
Q

[๐—›๐—ถ๐—ด๐—ต๐—ฒ๐—ฟ ๐—ง๐—ถ๐—ฒ๐—ฟ] Describe how an electric motor works

A

A coil of wire carrying a current in a magnetic field will experience a force on opposite sides of the wire - this is because the direction of the force depends on the direction of the current. These opposite forces cause the wire to rotate