Fun With Magnets: Class 6 Science NCERT Chapter 13

Key Features of NCERT Material for Class 6 Science Chapter 13 – Fun with Magnets

Chapter 13: Fun with magnets of NCERT Solutions for Class 6 Science narrates about the invention and working of magnets. In the previous chapter: Electricity and Circuits, you must have learned about the electric cell, electric bulb, electric circuits, and more. Further, let’s have a look at the world of magnets.

Quick revision notes

Magnetite is called a natural magnet. 

Working of a Magnet: A magnet discovers its utilization at various spots. For instance, cooler’s entryway, some pencil boxes, many toys, magnetic stickers, cleanser stand, pin stand, all utilize a magnet for their working.

Impact of a magnet on materials: A magnet pulls in specific materials, while some don’t get pulled in towards magnet. 

Magnetic materials: The materials which get pulled in towards the magnet are known as magnetic materials, e.g., iron, nickel, cobalt. 

Non-magnetic materials: The materials which are not pulled in towards the magnet are known as non-magnetic materials, e.g., cowhide, plastic, fabric, paper. Magnetic poles: Magnetic attraction is most extreme close to the closures of the magnet. These finishes are called magnetic poles. 

At the point when suspended uninhibitedly, magnet consistently adjusts in north-south (N-S) bearing. 

Lodestone: It was a stone utilized by mariners in times past to recognize headings when they were in the ocean. 

Compass: This is a little glass case containing a magnetized needle turned on a nail. The needle can turn uninhibitedly. Any place it is kept, its needle consistently rests in the north-south course. Ordinarily, the north-post of the needle is painted red or some other sign is given to distinguish north and south poles. So utilizing this needle, north and south can be recognized. 

The attraction between two poles: Opposite poles of two magnets draw in one another. It is called attraction. 

Repulsion between two poles: Similar poles of two magnets repulse one another. It is called repulsion. 

The magnetic impact can go through the screen: Magnetic impact can go through screens of certain substances like fabric, plastic, paper, glass, and so on. 

Magnets lose their properties in the event that they are warmed, pounded, or dropped firmly and scarcely.

When suspended freely, magnet always aligns in the north-south (N-S) direction.

To protect them, bar magnets ought to be kept two by two with their dissimilar to poles on a similar side. They should be isolated by a bit of wood while two bits of delicate iron ought to be put over their closures. For horseshoe magnet, orfe should keep a bit of iron over the poles.

Compass: This is a little glass case containing a magnetized needle rotated on a nail. The needle can pivot uninhibitedly and consistently rests in the north-south heading. 

Magnet: A magnet is a metallic item that pulls in iron or magnetic things. Magnetite: It is a metal of iron which has magnetic properties. 

North shaft: When suspended unreservedly, one post of the magnet consistently focuses on the north. This is known as the north-post. 

South shaft: When suspended unreservedly, the finish of a magnet focuses on the south. This is known as the south-post. 

Take a gander at the photos demonstrated as follows. Put a V’ detriment for the article that you think would adhere to a magnet and ‘x’ against the items that would not adhere to a magnet

Disclosure Of Magnets 

As indicated by a legend, the primary magnet was found by a Greek shepherd named Magnes. It is said that the nails from his perspective and the iron tip of his staff stalled out to an enormous dark stone on which he was standing. Greeks named this abnormal sort of rock ‘magnetite’. The Chinese likewise thought about magnets. Old Chinese mariners utilized magnets for a route. 

Magnets 

Magnets are made of materials that draw in objects made of specific substances like iron, cobalt, and nickel. They come in different shapes and sizes (Fig. 12.1). They can be found as a horseshoe, ring, tube-shaped, or bar shape. 

Not all articles are pulled in to magnets. Articles that are pulled in by a magnet are supposed to be magnetic, e.g., iron and nickel. Articles that are not pulled in by a magnet, are supposed to be non-magnetic, e.g., wood and plastic.

Poles Of a Magnet

At the point when magnetic materials (like iron filings) are carried near a magnet, they don’t adhere equally to all pieces of the magnet. They stick more on specific pieces of the magnet. These are known as the poles of the magnet. Magnetic powers are the most grounded at the poles. For instance, the two closures of a bar magnet are its poles. 

There are two kinds of poles in each magnet, independent of its shape. These are, by the show, called the North Pole (N) and the South Pole (S) (Fig. 12.2). The two poles can’t exist freely. That is, they generally come two by two. 

On the off chance that we break a bar magnet in the centre, we would get two pieces, each having the North Pole and the South Pole. We could continue breaking the magnet into littler pieces, and every time we would get both the poles in each piece. 

Using a Magnet To Find Directions

Today, we use magnets for different purposes. In antiquated occasions, the essential utilization of a magnet was to discover bearings. 

On the off chance that a magnet is permitted to move uninhibitedly, it stops toward a path near the Earth’s North-South course. This property of a magnet was utilized to discover bearings on the outside of the Earth by explorers. An instrument with a magnet that is utilized to discover headings is called a magnetic compass. 

It has a little magnetic needle at its middle. This needle can pivot uninhibitedly and consistently focuses on the Earth’s North-South course. Various headings (north, south, east, and west) are set apart on the compass. Figure 12.3 shows how one can discover headings utilizing a magnetic compass. 

Do you know why an unreservedly suspended magnet consistently focuses on the Earth’s north-south course? It acts like it is affected by another magnet. Be that as it may, where is this other magnet? It is simply the Earth. This arrangement happens as a result of the impact of the Earth, which itself acts like a monster bar magnet (Fig. 12.4). It impacts all the magnets (inside its district of impact) to adjust themselves along its North-South bearing. 

Attraction And Repulsion

At the point when two magnets are carried near one another, they are either pulled towards one another or drove away from one another. So, when the magnets are pulled towards one another, they are said to draw in one another. At the point when they have driven away from one another, they are said to repulse one another. Regardless of whether the magnets pull in or repulse relies upon which poles of the magnets are confronting one another. 

At the point when like poles of the magnets (N-N or S-S) are carried near one another, they repulse. This is called repulsion. 

At the point when not at all like poles of the magnets (N-S or S-N) are carried near one another, they draw in. This is called attraction. 

Types Of Magnets

There are two sorts of magnets: brief and permanent. Magnets that hold their magnetic properties just for a brief timeframe are called impermanent magnets. Magnets that hold their magnetic properties for an extensive stretch of time are called permanent magnets. 

Brief magnets are generally made of iron, cobalt, or nickel. These materials act like magnets just when they are close to a solid magnet. They rapidly lose their magnetic property if the impact of the solid magnet is expelled. 

Permanent magnets are produced using blends of iron, cobalt, or nickel with different materials. These make solid magnets and hold their magnetic properties for quite a while. 

Care Of Magnets

• A magnet can lose its properties because of the accompanying exercises. 
• Dropping from a stature 
• Hitting with a sledge 
• Applying heat 
• Inappropriate capacity can likewise cause loss of magnetic properties. 
• Bar magnets ought to be put away two by two, with Dropping from tallness not at all like poles nearby one another. A horseshoe magnet ought to be put away with a bit of delicate iron kept over its poles. 

Uses Of Magnets

Magnets have a few employments: 

Charge cards, ATM cards, and personality cards have a piece of magnetic material that stores data. 

TV and PC screens use magnets. 

PC hard plates and sound and videotapes have magnetic material that stores data. 

Magnets are utilized in getting substances made of iron from a scrapyard. 

Magnet: An item that draws in substances like iron, cobalt, and nickel is called a magnet. 

Magnetic compass An instrument with a magnet that is utilized to discover headings is called a magnetic compass. 

Impermanent magnets: Magnets that hold their magnetic properties just for a brief timeframe are called transitory magnets. 

Permanent magnets: Magnets that hold their magnetic properties for an extensive stretch of time are called permanent magnets. 

Just magnetic materials are pulled in by magnets. 

Each magnet has two poles: the North Pole and the South Pole. 

Magnetic powers are the most grounded at the poles of the magnet. 

An openly suspended magnet will stop in the Earth’s North-South heading. 

Like poles of two magnets repulse one another. 

Dissimilar to poles of two magnets draw in one another. 

Magnets can lose their properties in the event that they are dropped from a stature, hit with a sledge, warmed, or put away in an inappropriate way.