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Name: ____________________________________________ Group: __________ Support activities – Second Year of Secondary Cycle Two ACTIVITY 23 ANSWER KEY Date: __________________ ST STUDENT BOOK: Chapter 5, pages 163–168 RELATED HANDOUT: Concept review 23 Magnetism and electromagnetism 1. Complete the following sentences, using the words or groups of words in the box below. You may not need some words, and you may use others more than once. • • • • • • • • • • • • adding aligned artificial attract each other attraction circular cobalt coming out of conserve direction distance domains • • • • • • • • dynamic electromagnet(s) electromagnetism entering into ferromagnetic ferromagnetic core fingers geographic North Pole • increasing • like • magnetic field • magnetic field lines • magnetism • magnetized • mechanical • more powerful • motion • natural • nickel • not aligned • opposite • ore • • • • • • • • • • • permanent powerful right-hand rule rolled sharp blow solenoid south-seeking steel stopping temporary thumb Magnetism a) ________________________ describes all the phenomena caused by magnets. Magnets nickel are objects that can attract other objects containing iron, ________________________ or ore cobalt. Around 600 BCE, the Greeks discovered an ________________________ called © ERPI Reproduction and adaptation permitted solely for classroom use with Observatory. natural magnetite, which is a ________________________ magnet with this property. b) Certain metals have magnetic properties, which can be explained by their composition: they domains contain a set of regions called “________________________ ,” and each of these regions not aligned acts like a tiny magnet. The directions of these domains are ________________________ if magnetized the metal is not magnetized. If the metal is ________________________ , its domains will aligned be well ________________________ . The greater the number of aligned domains, the more powerful ________________________ the magnet. south-seeking c) Each magnet has a north-seeking and a ________________________ pole. By convention, the north pole of a magnet corresponds to the end that naturally turns toward the magnetic geographic North Pole pole that is located close to the Earth’s ________________________ . Observatory / Guide 11129-B 1 ANSWER KEY Support activities – Second Year of Secondary Cycle Two ACTIVITY 23 Magnetism and electromagnetism Name: ____________________________________________ Group: __________ Date: __________________ attraction d) Magnets interact with one another through forces of ________________________ and attract each other repulsion. In other words, opposite magnetic poles ________________________, and like ________________________ magnetic poles repel each other. These forces can act distance across a ________________________ . In a diagram of a magnetic field, they are magnetic field lines represented by ________________________. By convention, the lines are drawn entering into coming out of ________________________ the north pole and ________________________ the south pole of a magnet. e) Electricity can be used to make magnets. The interaction between magnetism and electromagnetism electricity is called “________________________ .” An electric current can generate a opposite magnetic field, and the ________________________ is also true. Only dynamic ________________________ electricity can generate a magnetic field because the motion electrical charges must be in ________________________. right-hand rule f) Using the ________________________ , we can determine the direction of the magnetic thumb field lines of a live wire. The ________________________ points in the direction of the current, from the positive terminal toward the negative terminal. The fingers ________________________ wrapped around the wire show the direction of the magnetic circular field lines. These lines are ________________________ . 2. The figure below represents the Earth, which is a large magnet. Complete the figure with the following terms. – geographic North Pole © ERPI Reproduction and adaptation permitted solely for classroom use with Observatory. – North Magnetic Pole – geographic South Pole – South Magnetic Pole Geographic North Pole South Magnetic Pole North Magnetic Pole Geographic South Pole Observatory / Guide 11129-B 2 ANSWER KEY Support activities – Second Year of Secondary Cycle Two ACTIVITY 23 Magnetism and electromagnetism Name: ____________________________________________ Group: __________ Date: __________________ 3. The circles below represent compasses. In each situation, draw the needles of the compasses, using an arrow to show the direction they point. a) b) 4. Draw the magnetic field of each of the magnets below. b) © ERPI Reproduction and adaptation permitted solely for classroom use with Observatory. a) Observatory / Guide 11129-B 3 ANSWER KEY Support activities – Second Year of Secondary Cycle Two ACTIVITY 23 Magnetism and electromagnetism