Class 6 Science Curiosity Solutions English Medium

NCERT Solutions Class 6 Science Curiosity English Medium

Chapter 4. Exploring Magnets

Topic: CBSE Full Notes

Chapter 4. Exploring Magnets

Magnets are useful objects that have been known to humans since ancient times. They possess the unique ability to attract certain materials without touching them. This special property, called magnetism, has made magnets an essential part of modern science and technology. Today, magnets are used in household appliances, industries, transportation, medical equipment, communication devices, and scientific instruments. Understanding the properties of magnets helps us explain many natural phenomena and everyday applications.

CBSE Full Notes

Magnets are found in different shapes and sizes depending on their uses. They can be natural or artificial and are capable of producing a magnetic field around them. This magnetic field allows magnets to exert force on magnetic materials even from a distance.

Magnets

A magnet is an object that attracts certain materials such as iron, nickel, cobalt, and some of their alloys. The attractive property of a magnet is called magnetism. Magnets are available in different shapes, but their magnetic properties remain the same.

Characteristics of Magnets

• Magnets attract magnetic materials.
• They possess two magnetic poles.
• They produce a magnetic field around them.
• They can exert force without direct contact.
• Their magnetic strength is greatest at the poles.

Natural and Artificial Magnets

Magnets are broadly classified into two categories based on their origin.

Natural Magnets

Natural magnets occur naturally in the form of a mineral called lodestone. They possess magnetic properties without any human intervention. Although natural magnets are useful, their magnetic strength is comparatively weak.

Artificial Magnets

Artificial magnets are made by humans and are available in different shapes according to their applications. These magnets are much stronger than natural magnets and are widely used in scientific and industrial equipment.

Common Shapes of Artificial Magnets

• Bar Magnet
• Horseshoe (U-shaped) Magnet
• Ring Magnet
• Disc Magnet
• Cylindrical Magnet

Magnetic and Non-Magnetic Materials

Materials can be classified according to their behaviour in the presence of a magnet.

Magnetic Materials

These materials are attracted by magnets and can themselves become temporary magnets under suitable conditions.

• Iron
• Nickel
• Cobalt
• Steel

Non-Magnetic Materials

These materials are not attracted by magnets because they do not respond to magnetic force.

• Wood
• Plastic
• Glass
• Rubber
• Paper
• Cloth

Magnetic Poles

Every magnet has two ends called the North Pole and the South Pole. These poles are the regions where the magnetic force is strongest. Iron filings gather in large quantities near these poles during experiments.

Important Points about Magnetic Poles

• Every magnet always has two poles.
• The poles cannot exist separately.
• Breaking a magnet produces smaller magnets, each having both poles.
• The maximum magnetic force acts at the poles.

Properties of Magnets

Magnets possess several unique properties that distinguish them from ordinary objects.

• Magnets attract magnetic materials.
• Every magnet has two poles.
• Like poles repel each other.
• Unlike poles attract each other.
• A freely suspended magnet always points in the north-south direction.
• Magnetic force can pass through several non-magnetic materials.

Earth as a Giant Magnet

The Earth behaves like a giant magnet because it has its own magnetic field. When a magnet is suspended freely, it aligns itself along the north-south direction due to the Earth's magnetic field. This property has been used for navigation for hundreds of years.

Importance of Earth's Magnetism

• Helps in finding directions.
• Makes magnetic compasses work.
• Supports navigation by travellers and sailors.

Magnetic Compass

A magnetic compass is an instrument used to determine directions. It contains a small magnetised needle mounted on a pivot so that it can rotate freely. The needle always aligns itself in the north-south direction under the influence of the Earth's magnetic field.

Applications of a Magnetic Compass

• Navigation
• Surveying
• Trekking
• Mountaineering
• Military operations

Attraction and Repulsion

When two magnets are brought close to each other, they either attract or repel depending on the poles facing one another.

Repulsion is considered the surest test to identify a magnet because only magnets can repel each other.

Magnetic Force Through Different Materials

Magnetic force can pass through several non-magnetic materials such as paper, plastic, glass, cardboard, and wood. This property enables magnets to attract objects even when a thin non-magnetic barrier is placed between them.

Uses of Magnets

Magnets have become an important part of modern life because of their wide range of applications.

• Magnetic compasses
• Refrigerator doors
• Cupboard locks
• Electric motors
• Generators
• Speakers
• Microphones
• Headphones
• Mobile phones
• Toys
• Magnetic cranes
• MRI machines
• Maglev trains

Care of Magnets

Magnets should be handled carefully to prevent loss of their magnetic strength.

Precautions

• Do not heat magnets.
• Do not hammer magnets.
• Avoid dropping magnets.
• Keep magnets away from electronic devices.
• Store bar magnets in pairs with unlike poles facing each other.
• Place soft iron keepers across their ends.
• Separate the magnets using a wooden strip while storing.

Remember These Points

• Magnets attract only magnetic materials.
• Iron, nickel, cobalt, and steel are magnetic materials.
• Every magnet has two poles.
• Magnetic force is strongest at the poles.
• Like poles repel and unlike poles attract.
• The Earth behaves like a giant magnet.
• A compass works due to the Earth's magnetic field.
• Repulsion is the surest test of a magnet.
• Magnets are widely used in science, industry, medicine, and transportation.
• Proper care helps magnets retain their magnetic strength for a long time.

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