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प्रश्न
Answer the following in short.
What is a magnet? Differentiate between natural and artificial magnets.
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उत्तर
A magnet is a piece of metal that can attract metals such as iron-cobalt and nickel. Naturally occurring rocks such as Lodestone or magnetite have the ability to attract magnetic substances and hence are called natural magnets.
Magnets that are made by man from magnetic substances ara called artificial magnets. These come in different shapes such as bar magnets, horseshoe magnets, disc magnets, and ring magnets. Artificial magnets can be made in any size, shape or strength as desired but natural magnets cannot be made as desired.
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संबंधित प्रश्न
Match the following
| Column A | Column B |
| (a). Human body | (1). electric bell |
| (b). Silk thread | (2). current |
| (c). Charge in motion | (3). conductor |
| (d). soft iron | (4). electromagnet |
| (e) . Electromagnet | (5). insulator |
“Poles exist in pair”. Comment on this statement ?
State if the following statement is true or false. Correct the statement if it is false.
As we move away from a magnet, its attraction power weakens.
The real test of a magnet is ______.
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.
Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
MRI stands for _______.
Magnets are used in _______ for generating electricity.
Why it is not advisable to slide a magnet on an iron bar back and forth during magnetising it?
