A bar magnet has north and south poles, and two like poles brought together repel, so this Year 8 sheet opens with the poles and their first behaviour. Field direction runs north to south, and iron is the magnetic material in the key.
Key Takeaways
A bar magnet has north and south poles (Q1).
Two like poles repel (Q2).
Field lines run from north pole to south pole (Q3).
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.A bar magnet has two poles called...
(a) east and west(b) north and south(c) up and down(d) positive and negative
2.When two like poles of two magnets are brought together, they...
(a) attract(b) repel(c) do nothing(d) lose their magnetism
3.Outside a magnet, magnetic field lines travel from...
(a) north pole to south pole(b) south pole to north pole(c) east to west(d) in circles only
4.Which of these is a magnetic material?
(a) copper(b) aluminium(c) iron(d) plastic
5.A compass needle points towards the north because of...
(a) the heat of the Sun(b) the magnetic field of the Earth(c) static electricity(d) the force of gravity
6.An electromagnet is made by...
(a) wrapping a coil of wire around an iron core and passing a current through it(b) heating a bar magnet(c) bending a magnet into a U shape(d) rubbing two magnets together
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.Name the two poles of a magnet.
8.State what happens when two like poles and two unlike poles are brought together.
9.What is a magnetic field?
10.Name three magnetic materials.
11.Describe one way to make a permanent magnet.
12.State one difference between a permanent magnet and an electromagnet.
13.Give one use of an electromagnet in everyday life or in industry.
14.What happens to the magnetic field of an electromagnet when the current is switched off?
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.An electromagnet lifts a load of scrap metal with a mass of 400 kg. Use weight = mass × g with g = 10 N/kg to calculate the weight of the scrap metal in newtons.
16.A scrapyard crane lifts 1.5 tonnes of cars. Given that 1 tonne = 1000 kg, use weight = mass × g with g = 10 N/kg to calculate the weight in newtons.
17.An electromagnet is made with 50 turns of wire. The number of turns is increased to 150 turns. The strength of an electromagnet is proportional to the number of turns. How many times stronger is the new electromagnet?
18.An electromagnet coil has a voltage of 9 V across it and a current of 3 A through it. Use resistance = voltage ÷ current to calculate the resistance of the coil in ohms.
19.An electromagnet can lift a maximum weight of 2500 N. Use mass = weight ÷ g with g = 10 N/kg to calculate the maximum mass it can lift in kilograms.
20.A bar magnet can hold 30 paper clips at its end. A second, stronger magnet can hold 90 paper clips. How many times stronger is the second magnet?
Answer Key
1. b) north and south
2. b) repel
3. a) north pole to south pole
4. c) iron
5. b) the magnetic field of the Earth
6. a) wrapping a coil of wire around an iron core and passing a current through it
7. Refer to solution guide.
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20. Refer to solution guide.
End of Worksheet
People Also Ask
What poles does a bar magnet have?
North and south, option (b) in this worksheet (Q1).
What do two like poles do when brought together?
Repel, option (b) in this worksheet (Q2).
Which material is magnetic?
Iron, option (c) in this worksheet (Q4).
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