4) Explain the directional property of magnets. How do the poles of a magnet get their names? Describe one application of this property.
5. Describe a simple experiment by which we can get an idea about the shape of the magnetic field produced by a bar magnet. Make a sketch of the field.
6. What is an electromagnet? How is it different from a permanent magnet? Why is iron used as the core of an electromagnet?
7. How can a magnet lose its magnetism? How should magnets be stored so that they do not lose their magnetism gradually?
8. Distinguish between a permanent magnet and a temporary magnet . Mention two uses of each.
9. What causes the earth to behave as a magnet? Where are the poles of this imaginary magnet?
Answers
Answer:
A freely suspended magnet always comes to rest in the north-south direction. This automatic alignment of the magnetic poles is referred to as the directive property of magnets. ... The end of the magnet which points to the north is named as the North Pole and the south-facing end is named the South Pole.
Answer:
A freely suspended magnet always comes to rest in the north-south direction. The end of the magnet which points to the north is named as the North Pole and the south-facing end is named the South Pole. This is the procedure of naming magnetic poles.
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Magnetic fields can be mapped out using small plotting compasses : place the plotting compass near the magnet on a piece of paper. move the plotting compass to many different positions in the magnetic field, marking the needle direction each time. join the points to show the field lines.
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The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
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Heat: The temperature change can cause demagnetization.At extreme temperature changes the atoms are rendered to moderate vibrations and with the increase of temperature beyond curie temperature the magnet will lose its magnetism.
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The difference between a permanent magnet and a temporary magnet is in their atomic structures. Permanent magnets have their atoms aligned all the time. Temporary magnets have their atoms aligned only while under the influence of a strong external magnetic field.
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On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet.
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