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प्रश्न
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 _____
What is a magnet?
Tick the most appropriate answer.
The surest test of magnetism is
Answer the following in short.
If a bar magnet is placed over iron filings, where will the attraction of the iron fillings be
- maximum?
- minimum?
If a bar magnet is hung by a thread tied at its center, its north pole becomes steady in the direction of the ______ Pole of the earth.
Distinguish between the two methods of making artificial magnets.
There are two knitting needles. One of them is magnetized. How will you find out which one is magnetized, if no other magnet is available?
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Name the metal used for E and F.
Give scientific reason:
Soft iron is used to make electromagnets.
Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
