Permanent & Induced Magnetism, Magnetic Forces & Fields Practice Questions

Question 1

4 marks

Amira tests five materials by holding one pole of a bar magnet close to each one. Her results are shown in the table.

Material	Attracted to the magnet?
aluminium	no
cobalt	yes
copper	no
steel	yes
plastic	no

(a)

Amira also has a sample of nickel and a sample of brass.

Predict whether each of these samples will be attracted to the magnet.

Nickel ______________________

Brass ______________________

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(b)

The force between the magnet and the steel is a non-contact force.

What is meant by a non-contact force?

/ 1

(c)

Amira slowly moves the magnet further away from the steel.

State what happens to the size of the force on the steel.

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Question 2

4 marks

Figure 1 shows a bar magnet. One magnetic field line has been drawn. Three points, A, B and C, are marked.

(a)

Which point, A, B or C, is the magnetic field strongest at?

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(b)

Give the reason for your answer to part (a).

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(c)

On Figure 1, draw an arrow on the field line to show the direction of the magnetic field.

Describe the direction your arrow points in.

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(d)

What is meant by a magnetic field?

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Question 3

3 marks

Figure 2 shows two bar magnets placed on a bench a short distance apart. Both magnets are free to move.

(a)

State whether the two magnets attract or repel each other.

Give a reason for your answer.

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(b)

Magnet 2 is now turned round so that its south pole faces magnet 1.

State what happens to magnet 2 when it is released.

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Question 0

6 marks

Figure 3 shows a bar magnet. A steel paperclip A hangs from the south pole of the magnet. A second steel paperclip B hangs from paperclip A. Paperclip B is not touching the magnet.

(a)

What is an induced magnet?

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(b)

Explain why paperclip B is attracted to paperclip A, even though paperclip B is not touching the magnet.

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(c)

The bar magnet is taken away.

State and explain what happens to the two paperclips.

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Question 0

6 marks

A student is given a bar magnet, a plotting compass, a sheet of plain paper and a pencil.

(a)

Describe a method the student could use to plot the magnetic field pattern of the bar magnet.

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(b)

Explain why the student should carry out this investigation away from other magnets and from iron objects.

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Question 0

5 marks

A magnetic compass can be used to find the direction of north.

(a)

What does a magnetic compass contain?

/ 1

(b)

The needle of a compass is made from steel and not from iron.

Explain why.

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(c)

Explain how the behaviour of a magnetic compass provides evidence that the core of the Earth must be magnetic.

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Question 0

8 marks

A student investigates how the force between two magnets changes with the distance between them.

One magnet rests on a top pan balance. A second, identical magnet is held above it by a clamp, with like poles facing each other. Figure 4 shows the apparatus.

With the top magnet removed, the balance reads $105.0$ g.

The student's results are shown in the table.

Separation in mm	Balance reading in g
10	132.0
20	118.5
30	112.0
40	109.0
50	107.5

(a)

Calculate the size of the force that the top magnet exerts on the lower magnet when the separation is $10$ mm.

gravitational field strength = $9.8$ N/kg

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(b)

Explain what the results show about the magnetic field of the top magnet.

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(c)

The student turns the top magnet round so that unlike poles face each other. The separation is set to $10$ mm.

Predict the reading on the balance.

Give a reason for your answer.

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Energy

Electricity

Particle Model of Matter

Atomic Structure

Forces

Waves

Magnetism & Electromagnetism

Space Physics

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