Magnetism

1. Name two ways in which the polarity of a material which has been magnetized by electrical method can be determined?

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2. Which of the following is not true when a material like a pin is magnetized by induction method?

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3. How can you test the polarity of a magnet?

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4. Which of the following is not a method of magnetization?

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5. A magnetic field line originates from the North Pole and ends at the South Pole. True or False?

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6. A magnet is an object which attracts magnetic materials such as cobalt, iron and nickel.

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7. Which of the following is not a property of magnets

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8. Explain how you can demagnetize a magnet using hammering method?

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9. Magnetic materials which are difficult to magnetize but once magnetized retain their magnetism for a long time are said to be:-

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10. Define the neutral point?

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11. Magnetic materials which are magnetized easily but do not retain their magnetism are said to be:-

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12. The region or space where magnetic influence is felt is called?

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13. Which of the following is NOT true about magnetic field lines?

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14. The direction of the magnetic field at a point is the direction which a free North Pole would move if placed at that point in the field?

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15. State the Clock rule

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16. Attraction in a magnet only occurs:-

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17. Which of the following is not an application of a magnet?

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18. Why is repulsion the only sure test of polarity of an unknown Magnet?

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19. What is the importance of keepers in the storage of magnets?

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20. Why are magnets placed in an East-West direction when they are being demagnetized?

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21. Which of the following statements is INCORRECT about the domain theory?

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22. Which of the following statements is correct about a magnetic field?

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23. Why are electrical measuring instruments and watches covered by soft iron rings?

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24. Define the basic law of magnetism

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25. The path along which a north pole would move if free to do so is called?

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26. Define ferromagnetic materials

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27. A magnet whose field lines are more concentrated means?

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28. Magnetic shielding is a property of certain materials to concentrate magnetic field hence leaving some areas totally free of magnetic influence?

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29. What happens when you heat a magnet?

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30. A material is said to be magnetically saturated when:-

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31. In the stroking method of magnetisation, the end of the material i.e. needle where the magnet finishes the stroking pattern acquires an opposite polarity to that of the stroking end of the magnet?

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32. Destroying the magnetic properties of a magnet is called?

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33. A material is said to be magnetized when most of its domains are aligned in 1 direction?

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34. Name the biggest disadvantage of the stroking method of magnetism?

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35. Which of the following method is not a demagnetization method?

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36. Which of the following methods is the sure test for polarity?

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37. State the Right-Hand Grip rule as applied to electromagnets

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