Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Magnetism and Electromagnetism
293 practice questions
Topics covered
Practice questions
281–290 of 293
Question 281
4 marks · Normal
Answer and see the solution →A power station supplies 20,000 V a.c. at a current of 800 A to a step-up transformer which is 100% efficient. The transformer increases the voltage for long-distance transmission. A second transformer later steps the voltage down to 5,000 V for use in a factory.
(a)[2 marks]Calculate the output current from the step-up transformer if the transmission voltage is increased to 100,000 V.
(b)[2 marks]Calculate the current supplied to the factory after the voltage is stepped down to 5,000 V, assuming 100% efficiency throughout.
Question 282
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 283
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 284
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 285
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 286
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 287
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 288
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?
Question 289
5 marks · Normal
Answer and see the solution →A bar magnet is placed on a table. Another bar magnet is brought nearby so that their closest ends are both north poles.
(a)[2 marks]State what happens between the two magnets and explain why.
(b)[2 marks]Draw and label the magnetic field pattern between the two north poles using field lines.
(c)[1 mark]Describe one feature of the magnetic field between the magnets.
Question 290
6 marks · Normal
Answer and see the solution →A student investigates how to create a uniform magnetic field using two bar magnets in the laboratory.
(a)[2 marks]Describe and draw the arrangement of two bar magnets to produce a uniform magnetic field between them.
(b)[2 marks]Explain why the field in the region between the magnets is described as 'uniform'.
(c)[1 mark]Give one use of a uniform magnetic field in a scientific or technical device.
(d)[1 mark]Suppose the magnets are moved further apart. Describe what happens to the uniform region.