Fun With Magnets - Class 6 Physics - Extra Questions

There is almost zero magnetic field near the middle of the bar magnet. So, if a compass is placed  near the middle of a bar magnet, the effect of earth's magnetic field will be stronger on the compass. So, the needle of the compass will rest in the north-south direction.

A magnetic compass is used to determine the direction of voyage of a ship in the middle of the sea.

An instrument in which the directive property of a magnet is used is compass needle.

Unlike poles always attract each other

Like poles always repel each other.

Steel is used to make permanent magnets.

Soft iron is used to make temporary magnets.

Magnets with single poles do not exist. Every magnet has two poles.

 

It is difficult to manually load and transport heavy scrap iron. Therefore, a permanent magnet of a very big size is necessary and this cannot be easily created. Hence, we create a powerful electromagnet by passing a current through a big iron disc. Thus, the big disc becomes powerful magnet and the scrap iron gets attracted to it, which can be easily loaded and transported. Hence a magnetic crane is used to load and transport scrap iron and the given statement is true.

When a compass is brought near a magnetized rod, the compass will show deflection. And the deflection will be opposite at the two ends.

Magnetite is a special kind of rock. It sticks to magnets. Magnetite is made of a metal called iron.

(1) Attractive property : A magnet has the property to attract some substances like iron cobalt and nickel when brought near it This property of magnet is called as an attractive property .
(2) Directive property : If we suspend a magnet freely with a thread  then it always aligns itself in the geographic north-south direction when it comes to rest This is called as directive property of a magnet.

Bar magnet, horse-shoe magnet and cylindrical magnet.

As the steel and iron both are magnetic materials and behave like a temporary magnets in presence of an external magnetic field. As the magnet remove, the magnetic properties of both Iron and Steel will vanish. and they become separated.

$$X$$ should be a magnet and $$Y$$ should be iron or steel etc. because in figure 1 the middle of the magnet a week force of attraction present and at the end of magnet maximum force of attraction occurs. So that in fig $$1, X$$ joint end with $$Y$$ and in fig 2 middle of $$X$$ joint with the end of $$Y$$.

Making a magnet : Take an iron strip and place it on the table. Now take a bar magnet and place one of its poles near one edge of the strip of iron. Without lifting it move it along the length of the iron strip till you reach the other end. Now lift the magnet and bring the pole to the same point of strip and observe that the strip attracts the fillings. This indicates that the iron strip becomes magnet. Remember that the pole of magnet and direction of its movement should not change.

Iron is used to make some part of sharpener due to which it is attracted toward magnet.

Paper is not a magnet as it cannot attract iron. But it is an insulator as it does not conduct heat and electricity.

A compass is a small case of glass. A magnetised needle is pivoted inside the box. The needle can rotate freely. Compass also has a dial with directions marked on it. The compass is kept at the place where we want to know the directions. When the needle comes to rest it indicates north-south direction. The compass is then rotated until the north and south marked on the dial are at the two ends of the needle.
Usually different colours are used to point the ends of needle to identify the north and the south poles.

Take the bar magnet and suspend it freely with help of a thread, the end that points towards north pole will be regarded as north end of the magnet. Take a bar magnet with known/marked poles on it. Let the north pole of the magnet be brought closer to the suspended magnet at the end that is pointing towards north, if it shows repulsion than it is confirmed.

A lodestone is a naturally magnetized piece of the mineral magnetite. They are naturally occurring magnets, which can attract iron.

$$(A)$$ Boat get attracted towards the magnet i.e Boat is made of magnetic material. That is why it is attracted towards magnet.

Magnetic compass, in navigation or surveying, is an instrument for determining direction on the surface of Earth by means of a magnetic pointer that aligns itself with Earth’s magnetic field.The needle always align in North-South direction.

Magnes.

Televisions, mobiles, CD, computers and many more devices are made up of magnetic materials and magnets in it. If you bring a magnet closer to it then it will spoil these devices.

Like forces on charged particles, the similar pole repels and dissimilar pole attract each other. The then correct match is,

We will take a bar magnet and first face its north pole towards the car, if the car gets attracted to it then the south pole is facing the front of the car. And if it is repelled then it means the North Pole is facing front of the car. This phenomenon is based on attraction and repulsion of the magnet. Alike poles repel and opposite pole attract each other.

You can prepare a magnetic compass by following method:
i. Place one needle on a wooden table
ii. Rub a magnet traverse the length of needle without lifting the needle.
iii. After you reach the end point of the needle, lift the magnet and again rub it in the same direction.
iv. Remember to keep the same direction and repeat the steps.
v. Now place the needle on the cork in a vessel containing water.
vi. The needle will shift and align itself in the 'North-South direction'.

Magnet attracts: (ii) iron, (iii) another magnet, (iv) iron filing

Magnet can be repelled by (iii) another magnet

Magnet if suspended freely (i) Rests along a particular direction

Poles of the magnet can be identified by (iii) another magnet

A magnet has two poles. North and South pole.

Like poles repel each other and unlike poles attract each other. This is the property of a magnet where the North-North Pole or South-South pole repel each other and the North-South pole attracts each other.

Magnetic substances: The substances that get attracted by a magnet are called magnetic substances. Iron, steel, cobalt and nickel are magnetic substance
Non-magnetic substances: The substances that do not get attracted by a magnet are called non-magnetic substances, e.g., wood, plastic, copper, paper, aluminium, rubber, stone.

Substances such as iron, nickel, cobalt, or their alloys that get attracted by a magnet are called magnetic substances.

Take iron filling on a piece of paper. Bring a bar magnet near It. An iron filling will cling to it. It shows the attractive property of magnets.

The substances which have the property of attracting iron, are called magnets.

The two ways of magnetizing an iron piece are:
1. Magnetic induction method: Take a long iron nail and test it for magnetic properties by bringing near the Magnetic substances. You will see nail does not attract magnetic substances. Now bring near a pole of a bar magnet to the head of the nail. Now bring the iron paper clips near the pointed end of the nail, you will observe that the iron paper clips now get attracted towards the nail. This is because iron nail has become a magnet. Now take the bar magnet away from the Iron nail, paper clips fall off. This magnetism is temporary.

2. Single touch method: Take a demagnetized piece of iron. Place It on a table surface. Take a magnet and select one pole. Now mb it with the selected pole on the iron in one direction for several times. After some time, the iron piece turns into a magnet. 

The poles of the magnet are located at the two ends of the magnet.

Magnetic compass is device which is used to locate the direction of a place.It always resists in a North -South direction.It is used in the navigators in:ships, submarines,aeroplanes etc.

A freely suspended magnet rests in the geographic North-South direction.

Hint: A compass is a tool for determining direction. It is one of the most significant navigational aids.

Explanation:

$$\bullet$$A compass has a freely rotating magnetic needle. 

$$\bullet$$The magnetic needle aligns in a north-south direction when a compass is held at a location. 

$$\bullet$$The north pole of the compass needle is the red arrow, and the south pole is the other end.

Paper is not a Magnetic material

The material which are attracted towards a magnet are called Magnetic materials.

The strength of the magnet is more at the poles as we see more number of magnetic field lines near the poles.

The pole of the bar magnet at the end pointing towards the south pole of the magnetic compass is south pole. This is because, like magnetic poles repel each other.

When one end of a bar magnet is  brought near to one end of an iron nail  then the end of bar magnet attracts that end of the nail by inducing a magnetic pole of opposite  polarity.

If we cut a magnet into pieces, then the end labeled as North will remain North and the other end formed will be South. Similarly, the end that was pointing South will be South pole and its opposite end will be the new north pole. 

a. No, There are different types of magnets.
b. Yes , Because the north pole of magnet turns to geographical north of earth and south pole turns to geographical south of earth.
c. No, There are natural and man made magnets.
d. Yes. Earth acts like a large magnet. Hence the pole of the suspended magnet is opposite to the poles of the earth's magnet.

Magnetic substance	Non magnetic substance
Iron	Plastic
Steel	Wood
Nickel	Copper
	Stainless steel spoon

We know that pole is the point where the strength of the magnet is maximum. So more and more iron particles will be attracted at poles of a magnet when we bring a magnet near the iron particles. We will observe the crowdness of particles at the ends of magnet. This indicates the presence of two poles in a magnet. Hence poles are present in a magnet in pair. If a magnet is divided into two parts, each part also possesses a pair of poles.

Stainless steel is non-magnetic in nature that is that it is not attracted by magnets. Magnets only attract metals with magnetic property like nickel, iron, cobalt, etc.

Soft iron is positioned on the edge of a U-magnet and the arrangement is stored in a timber box.
A wooden block is placed between two bar magnets which are facing the opposite direction to separate them and the edges are joined by soft iron bars.

Take the magnet with North-South poles marked. Keep it close with both the iron bars, and both will be attracted to it as both are magnetic. So test each of the two magnet bars one by one for repulsion test. If the first bar you took, repulses the marked magnet bar then it is the second magnet bar.

The magnets attract and repel both, while iron only attracts.

Magnets can be identified in following two ways-

i. Take both the metal bars and put them in the iron fillings and instantly bring them out. The magnet will have some iron fillings attracted to it and the simple metal bar will be plain.

ii. Take a magnet and bring it near both the metal bars one by one. The bar which either attracts or repels the magnet is itself a magnetic bar while the other is not.