Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Magnetism and Electromagnetism
293 practice questions
Topics covered
Practice questions
131–139 of 139 · Easy
Question 131
1 mark · Easy
Answer and see the solution →What is the approximate voltage supplied to homes after passing through a step-down transformer in the UK?
Question 132
4 marks · Easy
Answer and see the solution →Electricity generated at a power station is transmitted long distances before entering homes.
(a)[2 marks]Explain why a step-up transformer is used before electricity is transmitted through the National Grid.
(b)[2 marks]A step-up transformer increases the voltage from 10,000 V to 100,000 V. If the current in the primary coil is 50 A, and the transformer is 100% efficient, calculate the current in the secondary coil.
Question 133
4 marks · Easy
Answer and see the solution →A student is given a list of everyday items: a plastic spoon, a steel screw, an iron nail, and a wooden stick.
(a)State which of these items are magnetic materials. Give your reason.
(b)[2 marks]Describe one property of a magnetically soft material and one property of a magnetically hard material.
(b)[2 marks]Describe one property of a magnetically soft material and one property of a magnetically hard material.
Question 134
4 marks · Easy
Answer and see the solution →A student has a collection of materials: iron nail, copper coin, glass marble, and steel pin.
(a)[2 marks]State which of these materials are magnetic, and which are not. Give one property that distinguishes magnetic materials from non-magnetic materials.
(b)[2 marks]Explain why steel is used to make permanent magnets, but iron is not.
Question 135
4 marks · Easy
Answer and see the solution →A student investigates some materials to sort them as magnetic or non-magnetic.
(a)[2 marks]State whether each of the following is a magnetic material: iron nail, plastic ruler, nickel coin, rubber band.
(b)[2 marks]Magnets are said to be 'magnetically hard' materials. What does this mean about their magnetism?
Question 136
4 marks · Easy
Answer and see the solution →Look at the diagram showing two bar magnets facing each other with their north pole of one near the south pole of the other.
(a)[2 marks]What will happen between the two magnets in this arrangement? Explain your answer.
(b)[2 marks]Describe one property that all magnetic field lines show.
Question 137
4 marks · Easy
Answer and see the solution →A physics teacher demonstrates induced magnetism using an iron nail and a bar magnet.
(a)[2 marks]Describe what happens to the iron nail when it is placed next to the bar magnet and why.
(b)[2 marks]State whether the induced magnetism in the iron nail is temporary or permanent. Give a reason for your answer.
Question 138
4 marks · Easy
Answer and see the solution →The diagrams below show two ways of producing a uniform magnetic field using two bar magnets. One shows the north pole of one magnet facing the south pole of the other with a small gap between them.
(a)[2 marks]Describe the magnetic field in the region between the two poles.
(b)[2 marks]How could you recognise that the field in this region is uniform?
Question 139
4 marks · Easy
Answer and see the solution →A student sets up a circuit where a wire is connected to a battery and a plotting compass is placed under the wire.
(a)[2 marks]What effect does turning on the current have on the compass needle? Explain your answer.
(b)[2 marks]Which unit is used to measure the electric current in this circuit?