Chapter-13 Fun with Magnets

Answer: 

1. Reason - Artificial magnets are made in different shapes such as bar magnet, horse shoe and cylindrical.

Reason - Strong magnets created by humans are called artificial magnets. Because they generate extremely high amounts of magnetism but have tiny polar area surfaces, artificial magnets come in a variety of shapes, including bar magnets, horse-shoe magnets, and cylindrical magnets.

2.  The materials which are attracted towards a magnet are called magnetic.

Reason - Any magnetic field introduced from the outside is repelled by the materials. When they are affected by a magnetic field, this happens because their magnetic domains adjust to resist an externally applied magnetic field. So-called magnetic elements are those that are drawn to a magnet.

3. Paper is not a magnetic material.

Reason - Magnets are not drawn to paper because cellulose strands are usually present in paper. When a magnet is brought near to magnetic materials, they have the characteristic of being drawn to the magnet. A magnet or any other application of a magnetic field will not draw or resist paper. Paper is not a magnetic substance, therefore.

4.  In the olden days, sailors used to find direction by suspending a piece of magnet.

Reason - A magnet's north and south poles, when suspended, correspond to the earth's north and south poles, giving mariners a sense of orientation. It was an effective method for them because compass was not developed in ancient times.

5.  A magnet always has two poles.

Reason - Electric current generates magnetism. Because magnetic field lines are continuous and always make closed circles, a magnet will always have two poles, a north and a south. Magnets always have two sides because of this.

Answer: 

1. False

2. False

3. True

4. False

5. True (Freely suspended bad magnet)

6. True

7. False

Answer:

Magnetic substance is iron. Despite the pencil sharpener's plastic body, the magnet's polarities are drawn to it because iron is a magnetic substance. Iron, a ferrous substance, is used to make the sharpener's blade. As a result, a pencil sharpener is drawn to a magnet's two sides.

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Attractive property: This characteristic demonstrates the intensity of the magnetic field at the polar ends. By holding the magnet in the air, this characteristic makes it easier to distinguish between the north and south poles of a magnet. Magnetic polarities law while unlike poles draw, like poles resist. Items composed of nickel, cobalt, and iron are drawn to it. Like polarities of two magnets resist each other and opposite poles draw each other.

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A bar magnet's magnets are found at their extremities. North Pole 1. South Pole 2. One end of a bar magnet will face north and the other end will face south when the bar magnet is hung easily. They are referred to as the north and south poles of a magnet because of the characteristics of magnetic poles.

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The north pole of a bar magnet is at the extremity of the magnet, which is suspended in the air. The polarities of a bar magnet are not marked in any way. Take a bar magnet and hang it loosely from a string; the end of the magnet that faces the North Pole is considered to be its north end.

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Take a bar magnet, and with one edge of the iron bar, maintain touch with one of its magnets.

• Move the bar magnet until you reach the other end of the iron bar without moving it.

• The same rod you started with should be raised and brought back to the starting position of the iron bar.

• Repeat your previous motion of moving the magnet in the same way along the iron rod.

• This should be done 30 to 40 time’s total.

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A compass is a tool that uses magnetism as its foundation. It is made up of a magnetic needle that rotates independently and perpetually faces north. The north-south alignment of the magnetic points is constant. The North Pole is symbolized by the crimson marking on one end of the magnetic needle. The South Pole is represented by the needle's other end. The other two orientations can be approximated once these two are known. A compass can be used to locate the angles in this manner.

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