Magnetism , livre ebook

Capstone Global Library - Richard Spilsbury , Louise Spilsbury

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50 pages

English

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Everyone is familiar with magnets, but how much do we know about how they actually work? This book explores the basics of magnets, looking at topics such as poles, electromagnets, and how we use Earth's magnetic field to find our way.

Informations

Publié par	Capstone Global Library
Date de parution	15 août 2013
Nombre de lectures	0
EAN13	9781406270211
Langue	English
Poids de l'ouvrage	27 Mo

Informations légales : prix de location à la page 0,0312€. Cette information est donnée uniquement à titre indicatif conformément à la législation en vigueur.

Extrait

Essential Physical Science

Louise and Richard Spilsbury

Raintree is an imprint of Capstone Global Library Limited, a company incorporated in England and Wales having its registered oce at 7 Pilgrim Street, London, EC4V 6LB – Registered company number: 6695582

To contact Raintree, please phone 0845 6044371, fax + 44 (0) 1865 312263, or email myorders@raintreepublishers.co.uk.

Text © Capstone Global Library Limited 2014 First published in hardback in 2014 The moral rights of the proprietor have been asserted.

All rights reserved. No part of this publication may be reproduced in any form or by any means (including photocopying or storing it in any medium by electronic means and whether or not transiently or incidentally to some other use of this publication) without the written permission of the copyright owner, except in accordance with the provisions of the Copyright, Designs, and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency, Saron House, 6–10 Kirby Street, London EC1N 8TS (www.cla.co.uk). Applications for the copyright owner’s written permission should be addressed to the publisher.

Edited by Andrew Farrow and Abby Colich Designed by Cynthia Akiyoshi Original illustrations © Capstone Global Library Ltd 2014 Illustrated by HL Studios Picture research by Tracy Cummins Originated by Capstone Global Library Ltd Printed in China by China Translation and Printing Services

ISBN 978-1-4062-5993-3 17 16 15 14 13 10 9 8 7 6 5 4 3 2 1

British Library Cataloguing in Publication Data Spilsbury, Louise. Magnetism. -- (Essential physical science) 1. Magnetism--Juvenile literature. I. Title II. Series III. Spilsbury, Richard, 1963- 538-dc23 ISBN-13: 9781406259933

AcknowledgementsWe would like to thank the following for permission to reproduce photographs: Alamy: p. 31 (© Caro); Capstone Library: pp. 7 (Karon Dubke), 10 (Karon Dubke), 11 (Karon Dubke), 14 (Karon Dubke), 16 (Karon Dubke), 24 (Karon Dubke), 25 (Karon Dubke), 40 (Karon Dubke), 41 (Karon Dubke); Corbis: p. 38 (© Imaginechina); Getty Images: pp. 17 (Martin Leigh), 27 (Science Images/UIG), 29 (Image Source), 30 (Eco Images), 32 (Monty Rakusen), 33 (Arnt Haug); 37 (Ingram Publishing); Nasa: p. 43; newscom: pp. 19 (Splash News), 39 (suministrada/El Nuevo Dia de Puerto Rico); Photo Researchers: pp. 12 (Spencer Grant), 18 (Cordelia Molloy / Science Source), 22 (Scott Camazine), 26 (Doug Martin / Science Source); Shutterstock: pp. 6 (© Borislav Toskov), 9 (© Krom), 13 (© dondesigns), 21 (© corepics), 35 (© Zadorozhnyi Viktor); Superstock: pp. 4 (BE&W), 5 (imagebroker.net), 20 (Axiom Photographic Limited), 42 (imagebroker.net).

Cover image of a cluster of iron llings being attracted by a horseshoe magnet reproduced with permission from Photo Researchers (Tek Image / Science Source).

Every eort has been made to contact copyright holders of material reproduced in this book. Any omissions will be rectied in subsequent printings if notice is given to the publisher.

Disclaimer All the internet addresses (URLs) given in this book were valid at the time of going to press. However, due to the dynamic nature of the internet, some addresses may have changed, or sites may have changed or ceased to exist since publication. While the author and publisher regret any inconvenience this may cause readers, no responsibility for any such changes can be accepted by either the author or the publisher.

Contents

What is magnetism? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 How do magnets work? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 What are magnetic materials? . . . . . . . . . . . . . . . . . . . . . . . 12 What are magnetic fields? . . . . . . . . . . . . . . . . . . . . . . . . . . 18 How do electromagnets work?. . . . . . . . . . . . . . . . . . . . . . . 26 What do we use electromagnets for?. . . . . . . . . . . . . . . . . . 34 What has magnetism done for us? . . . . . . . . . . . . . . . . . . . . 42 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Find out more. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Eureka moment! Learn about important discoveries that have brought about further knowledge and understanding.

Some words are shown in bold,like this. You can find out what they mean by looking in the glossary.

i know Discover fascinating facts about magnetism.

WHAT’S NEXT?

Read about the latest research and advances in essential physical science.

What is magnetism? Magnetism is aforcewe use every day without really knowing it is there. A force is something that can pull or push on an object. Amagnetcan pull on iron paper clips to lift them up and it can push on another magnet to make it jump or slide I L I N away from it. If you have ever played with magnets, you know that they stick to each other and to some types of metals.

Using magnets There are magnets inside the edges of fridge doors too, helping to keep them closed! Magnets help to make many things work. Magnets are often found in can openers, holding the lid to the opener, and many bags have magnetic clasps to hold them shut. There are magnets in door bells, telephones, and televisions, and computers and CD players use magnets too. Magnetism is also that make motors used in electric machines like food mixers and electric toothbrushes work.

Eureka! More than 2,000 years ago, the Ancient Greeks found a mineral that attracted things made of iron. The word magnet probably comes from an area in Turkey called Magnesia, where the ancient Greeks found lots of these minerals in the ground.

When you hold a magnet close to a fridge door, you can feel the force of magnetism pulling it towards the metal door.

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