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प्रश्न
Give a reason for the following.
Electromagnets are temporary magnets.
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उत्तर
An electromagnet is a temporary magnet because it behaves like a magnet only till the current is passed through it. When the ~ current is stopped, it stops behaving like a magnet.
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संबंधित प्रश्न
Write true or false of the following statement.
Artificial magnets are weaker than the natural magnets.
Select the correct answer
Making a magnetic substance a magnet by bringing it closer to another magnet without touching it, is
What are natural and artificial-magnets?
Describe the method by which an iron bar can be made a magnet.
State three differences between the temporary and permanent magnets.
Tick the most appropriate answer.
Temporary magnets are made of
Fill in the blank.
Permanent magnets are generally made of steel, cobalt, nickel, or an alloy called ...............
Answer the following in detail.
Distinguish between a temporary magnet and a permanent magnet.
Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.
| Column I | Column II |
| N - N | ______ |
| N - ______ | Attraction |
| S - N | ______ |
| ______ - S | Repulsion |
You are given an iron strip. How will you make it into a magnet?
