Concepts

Class 10
Chapter 13 Class 10 - Magnetic Effects of Electric Current

First, let us see what a Magnet is

## What is a Magnet

It is an object which attracts other objects like iron, steel etc

Example

• If we bring a piece of iron near a magnet, it gets attracted towards the magnet
• If we brings 2 magnets together, they also attract each other

## What is a bar magnet?

A bar magnet is a rectangular magnet

It is a permanent magnet

It has two poles - North Pole and South Pole

## Properties of Bar Magnet

Since bar magnet is a permanent magnet, it will have the same properties as that of permanent magnet

It's properties are

• It has two poles - North Pole and South Pole
• It attracts iron and steel particles
• Like poles repel each other, unlike poles attract each other
• When freely suspended, north pole of magnet points towards north pole of the earth
• They are permanent magnets - they do not lose their magnetism
• Magnetic field is maximum at the poles, and minimum as we go towards the center

## Magnetic Field Lines in a Bar Magnet

If we sprinkle iron filings on the bar magnet, they would arrange in this form

This arrangement of iron filings is actually magnetic field lines

Which we we will study in the next post - Magnetic Field Lines

## Uses of a Bar Magnet

Since bar magnet is a permanent magnet, it will have the same uses as that of permanent magnet

It's uses are

• Magnets are used in Compass
• Bar magnets are used in Fridge Magnets.
• They are used to scan the body, like in MRI (Magnetic Resonance Imaging)

## Alnico and Neodymium Bar Magnet

Actually, Bar Magnet is usually of two types

• Alnico Bar Magnet -  Made up of aluminium, nickel, cobalt, and iron
• Neodymium Bar Magnet -  Made up of neodymium, boron, and iron

## Questions

Q1 Page 224 - Why does a compass needle get deflected when brought near a bar magnet?

Q1 Page 228 - Draw magnetic field lines around a bar magnet.

Q2 Page 228 - List the properties of magnetic field lines.

Q3 Page 228 - Why don’t two magnetic field lines intersect each other?

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