Question

1. Give a short description of an activity to find the poles of a given magnet..
2. Explain a simple method by which an iron needle can be magnetised.
3. Write a short note on 'Care of Magnets.
4. What are magnets used for?​

Answer 1

Explanation:

1. Take a bar magnet and keep in contact with one of its poles with one edge of the bar of iron. Without lifting the bar magnet, move it along the length of the iron bar till you reach the other end. Lift the magnet and bring the pole (the same pole you started with) to the same point of the iron bar from which we began.
2. Given a piece of iron and a bar magnet, the piece of iron can be magnetised by single touch method wherein one pole of a magnet is used to stroke the iron piece from its one end to the other end repeatedly until it gets magnetised.
3. Store your magnets with a keeper – A keeper is a small piece of iron that is generally added temporarily between the north and south poles of a magnet. ...
4. Store your magnets in pairs – Keep magnets in pairs to avoid both north and south sides from touching.
5. Magnets are used to make a tight seal on the doors to refrigerators and freezers. They power speakers in stereos, earphones, and televisions. Magnets are used to store data in computers, and are important in scanning machines called MRIs (magnetic resonance imagers), which doctors use to look inside people's bodies.

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