P3: Magnetism Flashcards

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1
Q

Identify the 2 magnetic poles.

A

North pole

South pole

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2
Q

North poles ______ North poles

A

Repel

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3
Q

South poles ______ North poles

A

Attract

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4
Q

A material that is attracted to a magnet is called a…

A

magnetic material

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5
Q

Identify the 3 magnetic metals found in the periodic table.

A

Iron

Nickel

Cobalt

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6
Q

Why is steel magnetic?

A

It contains iron

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7
Q

The invisible force field that surrounds a magnet is called a…

A

magnetic field

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8
Q

If a magnetic material is placed in a magnetic field, what happens?

A

A force acts on the material (push or pull)

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9
Q

Draw the magnetic field lines that represent a magnetic field on the magnet below:

A
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10
Q

Which 2 methods can we use to observe the magnetic field lines around a magnet?

A

Iron filings

Plotting compasses can show the shape AND direction of the field lines.

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11
Q

Which direction do the magnetic field lines travel in?

A

From the North pole to the South pole

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12
Q

What does it mean if the magnetic field lines are close together?

A

The magneitc field is stronger.

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13
Q

State some uses of electromagnets.

A
  1. Maglev trains
  2. X-Ray machines
  3. Starting a car engine.
  4. Scrapyards - lifting cars
  5. Motors in microwaves (to turn plate)
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14
Q

How are magnets used in maglev trains?

A

Magnets on the train and tracks repel each other so the train ‘hovers’ so there is no friction between the train and the tracks.

Magnets repel the train forwards so no engine is needed.

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15
Q

How can you make an electromagnet using an iron core, wire, battery to separate a pile of paperclips and bits of paper.

A
  1. Wrap the wire around an iron nail.
  2. Connect it to the battery.
  3. Iron paperclips will be attracted to the electromagnet, paper will not.
  4. Move the electromagnet over the pile of paperclips and paper
  5. Move the electromagnet away and turn off the battery to allow the paperclips to drop.
  6. Repeat until all the iron has been removed leaving a pile of copper.
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16
Q

How can you make an electromagnet stronger?

A

Add more loops of copper wire around the core.

Increase the current going through the coil of wire.

Use a magnetic metal as the electromagnet core (Iron, Nickel, Cobalt)

17
Q

For an electromagnet to have a magnetic field a _______ must be flowing through the coil of wire around the core.

A

current

18
Q

Electromagnets usually have a magnetic material in the centre of a coil of wire called a…..

A

……core

19
Q

Most electromagnet cores are made from…

A

……iron

20
Q

What is the pro and con of using iron as an electromagnet core?

A

Pro: It is easy to magnetise.

Con: It loses its magnetism easy.