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 Magnetism 40 Flashcards |
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Which of the following materials is NOT magnetic? A) Iron B) Nickel C) Wood D) Cobalt |
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C) Wood |
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Riddle: I can attract iron but can’t be seen, my strength fades as I move away. What am I? |
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Magnetic field |
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True or False: When a magnet is broken, each piece retains both a north and south pole. |
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True |
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The area around a magnet where it can exert force is known as its ______. |
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Magnetic field |
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What method involves moving the north pole of a magnet along an iron bar to magnetize it? |
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Single touch method |
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Which method of magnetization uses electric current to create a magnetic field? |
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Electrical method |
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True or False: Electromagnets are permanent magnets that retain their magnetism without electric current. |
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False. Electromagnets are temporary magnets that require electric current to maintain magnetism. |
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Fill in the blanks: The Earth's _______ is near the geographical south pole, while the magnetic _______ is near the geographical north pole. |
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Magnetic north pole, south pole |
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What is the term for the phenomenon when a magnet becomes weak over time due to its poles being left free? |
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Self-demagnetisation |
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Which type of magnets are used in devices like electric doorbells and generators? |
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Temporary magnets |
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Riddle: I am often used to find directions, and my needle points north. What am I? |
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Magnetic compass |
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True or False: The strength of a magnet is weakest at its poles. |
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False. The strength of a magnet is strongest at its poles. |
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Fill in the blanks: The process of turning an ordinary piece of material into a magnet is called ______. |
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Magnetisation |
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What is the term for the lines that show the direction of a magnetic field? |
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Magnetic lines of force |
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Which method of magnetization involves using two magnets of opposite poles touching an iron bar? |
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Double touch method |
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True or False: Permanent magnets lose their magnetism as soon as the magnetizing force is removed. |
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False. Permanent magnets retain their magnetism even after the magnetizing force is removed. |
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Fill in the blanks: The __________ is the line connecting the geographical north and south poles of the Earth. |
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Geographical axis |
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What happens to magnetic lines of force when they are close together? |
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The magnetic field is strong. |
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Riddle: I can be turned off, and my strength varies with the current; I am made of wire and a core. What am I? |
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Electromagnet |
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Which historical figure is known as the 'Father of Electricity and Magnetism'? |
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Sir William Gilbert |
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