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प्रश्न
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उत्तर
Disadvantages of setting up large dams for hydro-electricity power station::
(1) It leads to large catchment area being submerged
(2) displacement of people from their places.
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संबंधित प्रश्न
Fill in the blank
Like poles ______ each other and unlike poles _____
How will you do this?
Explain that a magnet has a certain magnetic field.
If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, ______ bar magnets are formed, and a total of _____ poles are formed.
When magnetic material is taken close to a magnet, the material acquires ______.
Fill the blank spaces in the table given below:
| Nature of bar | Action of compass needle | |
| North Pole | South Pole | |
| Non-magnetic | No action | ________ |
| ________ | attracted | attracted |
| North pole of a bar magnet | ________ | _________ |
| ________ | attracted | repelled |
Draw a clearly labelled diagram, to show how a steel bar is magnetised by a divided touch method. A written description is not required.
What do you understand by the term magnetic declination?
With the help of a diagram explain the following:
Magnetisation of steel needle using electric current such that the pointed end should have north polarity.
Distinguish between
Natural and artificial magnets.
Give the uses of magnets in everyday life.
