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Questions and Answers
______ of different shapes can be seen in Fig.10.4
Magnets
It is said that natural magnets were discovered when a shepherd's stick got attracted to a rock made of ______
magnetite
Substances that attract iron are now known as ______
magnets
______ was first discovered at a place called Magnesia
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Pieces of certain rocks that attract iron are named ______
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Artificial magnets are prepared in different shapes like bar magnet, horseshoe magnet, cylindrical, or a ______ magnet
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Artificial magnets are made in different shapes such as __________, __________ and ____________.
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The Materials which are attracted towards a magnet are called________.
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Paper is not a ______ material.
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In olden days, sailors used to find direction by suspending a piece of __________.
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A magnet always has __________ poles.
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A cylindrical magnet has only one pole.
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The materials which get attracted towards a magnet are magnetic – for example, iron, nickel or ______
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The materials which are not attracted towards a magnet are ______
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Is soil a magnetic or a ______ material?
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A tailor was stitching buttons on his shirt. The needle has slipped from his hand on to the ______. Can you help the tailor to find the needle?
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Rub a magnet in the sand or soil. Pull out the magnet. Are there some particles of sand or soil sticking to the magnet? Now, gently shake the magnet to remove the particles of sand or soil. Are some particles still sticking to it? These might be small pieces of ______ (iron filings) picked up from the soil.
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Through such an activity, we can find out whether the soil or sand from a given place contains particles that have ______.
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Study Notes
Natural Magnets
- Natural magnets were discovered when a shepherd's stick attracted a rock made of magnetite.
- Substances that attract iron are known as magnets.
Types of Magnets
- Magnets were first discovered at Magnesia.
- Certain rocks that can attract iron are called lodestones.
- Artificial magnets can be shaped as bar magnets, horseshoe magnets, cylindrical magnets, or disc magnets.
Magnetic Properties
- Materials attracted to a magnet are termed magnetic materials.
- Common magnetic materials include iron and nickel, while paper is not magnetic.
- Sailors historically used a suspended magnet to help navigate.
Magnet Characteristics
- Every magnet has two poles: north and south.
- A cylindrical magnet is often described as having a single pole, which is incorrect as it still possesses both poles.
Magnetic Materials
- Non-magnetic materials do not respond to magnetic forces.
- Soil can be analyzed to determine if it contains magnetic properties.
Practical Activity
- A magnet can be used to retrieve small iron objects from soil or sand.
- Iron filings picked up by a magnet indicate the presence of iron particles within the soil or sand sample.
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Description
Learn about the discovery of natural magnets through the story of a shepherd's stick getting attracted to a rock on the mountainside. Find out how magnetite rocks were named and their role in the history of magnetism.
