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प्रश्न
State four important properties of a bar magnet?
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उत्तर
- Attractive property: A magnet can attract small pieces of iron filing or other ferromagnetic materials.
- Directive property: If a magnet is suspended horizontally by a thin thread (say silk thread), it rests always pointing north-south direction of the earth.
- Like poles always repel each other and unlike poles attract each other.
- Poles always exist in pairs: Single pole can never exist.
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संबंधित प्रश्न
Fill in the blank
To light a table lamp and to run a refrigerator, we use ______ as the source of electricity.
Select the correct alternative
A freely suspended magnet rests in
Answer the following.
Why is it not possible to isolate a single magnetic pole?
State if the following statement is true or false. Correct the statement if it is false.
Whenever a magnet is not in use, it should be stored along with other magnets.
If a magnet is carefully broken into two pieces as shown in figure (i), how does the magnetic strength of each piece compare with that of the original magnet? If another magnet is carefully broken in half along its long axis shown in figure (ii), how would the strength of each piece compare with that of the original magnet?
Give scientific reason:
Two steel needles hanging from the lower end of a vertical bar magnet do not hang vertically.
Differentiate between:
Primary and secondary cell.
State the laws of magnetism.
Consider the statement given below and choose the correct option.
Assertion: Iron filings are concentrated more at the magnetic poles.
Reason: The magnets are so sharp.
What will happen when we place magnets near cell phones, computers, and DVDs?
