Question

Four important properties of a bar magnet

Answer 1

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Properties of bar magnet

are :

• Attractive Property – Magnet attracts ferromagnetic materials like iron, cobalt, and nickel.

• Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other.

• Directive Property – A freely suspended magnet always points in a north-south direction.

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Applications of Magnets :

A magnet is used to separate the useful magnetic substance like steel and iron from waste by the method of magnetic separation.

• This is done as follows. An electromagnet is fitted to the long arm of the crane.

• This is lowered over the heap of waste material and electromagnet is switched on.

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Question and Answer:

Q1. Poles are not marked in a bar magnet. How will you find out its poles?

Ans: To find out the poles, we will take another bar magnet with known poles.

We will bring one of the poles of the given magnet close to the north pole of the magnet. If it attracts the pole is the south pole. If it repels it is North pole.

Q2. You are provided with two identical metal bars.

One out of the two is a magnet.

Suggest two ways to identify the magnet.

Ans: Both are freely suspended.

One who will align in the north-south direction is a magnet, Bring a magnet close to both the metal bars and test with both the poles.

One who shows repulsion is a magnet.

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