Q 1. A substance that has the ability to attract certain kinds of ferrous (containing iron) metals is known as a(n) . Question 2 2. The magnetic field, consisting of many lines of magnetic force, running from the north pole to the south pole of a magnet is called the magnetic . 3. If a magnetized bar of steel were broken into three pieces, what effect would it have on the magnetism of pieces of the steel bar? Question 5. The property of a substance to conduct a magnetic field is called . Question 6 5. The resistance a material has to conducting a magnetic field is called . Question 7 6. Like poles__________ each other. 7. The strength of the magnetic force of a coil depends on what two factors? Question 11 8. A coil of 500 turns has a current of 2 amperes flowing through it. What is its field strength? Question 12 9. Why will a solenoid coil increase its magnetic strength when an iron core is inserted? 10. Describe how a control circuit in a relay coil is used both when establishing and removing a magnetic field. Question 14 11. Why will a magnet pick up a nail? Question 15 12. What is the purpose of magnetic shielding?

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