Magnetism Concise ICSE Class-9th Physics Solutions Selina Publishers

Chapter-10 Magnetism Revised Physics Solved Questions of Exercise

Magnetism Concise ICSE Class-9th Physics Solutions Selina Publishers Chapter-10.  Step By Step Revised Concise Selina Physics Solutions of Chapter-10 Magnetism with Exe-10(A) , MCQ 10(A) , Exe-10(B), MCQ-10(B) . Visit official Website CISCE for detail information about ICSE Board Class-9.

Magnetism Concise ICSE Class-9th Physics Solutions Selina Publishers


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Exe-10(A)

MCQ-10(A)

Exe-10(B)

MCQ-10(B)

Note :-  Before Viewing Selina Concise Physics Solutions of Chapter-10 Magnetism for ICSE Class-9 Physics. Read the whole chapter carefully and Solved all example of Chapter-10 Magnetism for Class-9 Physics.

latest syllabus of council class 9th physics

According to latest syllabus of council class 9th physics, Law of reflection, character of image, Spherical Mirror, Ray diagram and use of spherical mirror, Type of mirror, radius of curvature, Pole, Principal Axis, Focus and Focal Length.


Exe-10(A) Magnetism Selina 9th Physics Solutions Chapter-10

Question 1

What is a lodestone?

Answer 1

Lodestone is an ore of iron oxide (Fe3O4). This ore attracts small pieces of iron and it sets itself along a definite direction when it is suspended freely. It is a natural magnet which was used for the navigation by the mariners.

Question 2

What is a natural magnet? State two limitations of a natural magnet.

Answer 2

The pieces of lodestone found in nature are called the natural magnets. Limitations of a natural magnet are as listed below:

(i) They are irregular and odd shaped.

(ii) They are not magnetically very strong.

Question 3

What is an artificial magnet? State two reasons for the requirement of artificial magnets.

Answer 3 

An artificial magnet is a magnetized piece of iron (or other magnetic material). Artificial magnets are required because natural magnets have odd and irregular shape and they are not magnetically very strong. Artificial magnets can be given desired shape and made very strong.

Question 4

How will you test whether a given rod is made of iron or copper?

[Hint : Iron rod gets magnetised when placed near a bar magnet by magnetic induction, while copper rod does not get magnetised]

Answer 4

Iron rod is magnetized when placed near a bar magnet by magnetic induction, while copper rod is not magnetized.

Question 5

You are provided with two similar bars, one is a magnet and the other is a soft iron. How will you distinguish between them without the use of any other magnet or bar?

[Hint : A magnet when suspended freely will rest only in the north-south direction, but the soft iron bar will rest in any direction]

Answer 5

A magnet when suspended freely will rest only in north-south direction, but the soft iron bar will rest in any direction.

Question 6

Fill in the blanks to complete the sentences:

(a) The two ends of a magnet are called __________.

(b) Unlike poles of a magnet ___________ each other.

(c) Like poles of a magnet ______________ each other.

(d) A freely suspended magnet rests in the geographic ___________ direction.

Answer 6

(a) Poles, (b) Attract (c) repel (d) north-south

Question 7

A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it rest? Draw a diagram to show it.

Answer 7

If a small magnet is suspended by a silk thread such that it can swing freely then it rests itself in the geographic north-south direction.

Magnetism concise 9th physics solution Exe-10(A) Ans-7

Question 8

Explain the meaning of the term induced magnetism.

Answer 8

The magnetism acquired by a magnetic material when it is kept near (or in contact with) a magnet, is called induced magnetism.

Question 9

Explain what you understand by magnetic induction. What role does it play in attraction of a piece of iron by a magnet?

Answer 9

The process in which a piece of magnetic material acquires the magnetic properties temporarily in presence of another magnet near it is called the magnetic induction.

When a piece of iron is placed near or in contact with a magnet, the piece of iron becomes a magnet i.e., it acquires the property of attracting iron filings when they are brought near its ends. Thus, a piece of iron behaves as a magnet as long as it is kept near (or in contact with) a magnet.

Question 10

Explain the mechanism of attraction of iron nails by a magnet when brought near them.

Answer 10

When iron nails are brought near one end of a magnet, the nearer end of piece acquires an opposite polarity by magnetic induction. Since unlike poles attract each other, therefore, iron nails are attracted towards the end of the magnet. Thus, the iron nail first becomes a magnet by induction and then it is attracted.

Question 11

Explain the following :

(a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends moves apart.

(b) Several soft iron pins can cling, one below the other, from the pole of a magnet.

(c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.

Answer 11

(a) When two pins are hung by their heads from the same pole of a magnet, they acquire same polarity. Because like poles repel each other, their pointed ends move apart.

(b) Several soft iron pins can cling one below the other from the pole of a magnet because the magnet induces magnetism in an iron nail which gets attracted by the magnet and clings to it. This magnetized nail magnetizes the other nail near it by magnetic induction and attracts it. This process continues until force of attraction on first nail is sufficient to balance the total weight of all nails in chain.

(c) When a piece of soft iron is placed a little distance away from the needle, the needle induces magnetism to the piece of soft iron. Thus, soft iron piece starts behaving like a magnet and it attracts the magnetic needle towards it.

Question 12

A small iron bar is kept near the north pole of a bar magnet. How does the iron bar acquire magnetism? Draw a diagram to show the polarity on the iron bar. What will happen if the magnet is removed?

Answer 12

The iron bar acquires magnetism due to magnetic induction.

Magnetism concise 9th physics solution Exe-10(A) Ans-12

If the magnet is removed, the iron bar loses its magnetism.

Answer 13

‘Induced magnetism is temporary’. Comment on this statement.

Answer 13

Induced magnetism is temporary as it lasts as long as the magnet causing induction remains in it vicinity.

Question 14

‘Induction precedes attraction’. Explain the statement.

Answer 14

When a piece of magnetic material is brought near a magnet, it first becomes a magnet by induction and then it is attraction. Thus, we say that induction precedes attraction.

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