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Transcript
Magnetism 1. Draw a sketch of the magnetic field produced by a bar magnet. 2. Label the magnet poles (A, B) north or south in the following diagram. B N P N A 3. What do two north poles do to each other? 4. What does a north pole do to a south pole? 5. Where is the magnetic field of a bar magnet strongest? 6. Which of the following cannot be magnetized: nickel aluminium iron brass 7. The next diagram shows a demagnetised bar. (a) Write down TWO ways of magnetising it. (b) Beside the diagram draw another diagram to show how the tiny molecular magnets would be arranged when it was completely magnetised. 1 8. Write down four uses of permanent magnets. 9. You have two bars of metal of equal sizes, one is iron and the other one is steel. Which one would you use to make a permanent magnet and why? 10. How can you use the magnetic field lines to get an idea of the strength of the magnetic field? 11. What is meant by: (a) geographic north (b) magnetic north? 12. Two bars of metal are arranged as shown in the next diagram. Which one is the magnet, A or B? Bar A Bar B Bar A Bar B In this arrangement the bars attract each other In this arrangement the bars do not attract each other 13. What is an electromagnet? 14. Write down three ways of making an electromagnet stronger. 15. Which material is used for the core of an electromagnet – iron or steel? And why? 2
