Concise Physics Class 9 ICSE Solutions for Chapter 10 - Magnetism

Electricity and Magnetism come combined in the ICSE Class 9 Physics Exam. At Vedantu, you will get the updated syllabus for the ICSE 2020-21 exam with concepts of the lessons provided in Chapter 10 Magnetism. They are:

Concise ICSE Solutions Class 9 Physics Chapter 10

For your convenience, we provide you with some solved question answers of the Selina book for Chapter 10 Magnetism. Please go through them.

Q1: Explain the term ‘Induced Magnetism.’

Ans: 

• The process in which a magnetic material acquires a temporary magnetism when it is kept near to the magnet. Such as iron fillings when kept close to a magnet, turns into the magnet by induction, then it is attracted. 

• On moving the magnet away from it, the material loses its magnetism. Such temporary acquiring of magnetism is called induced magnetism.

Q2: State the reasons for using artificial magnets.

Ans: An artificial magnet is a piece of magnetic material. The reason for using artificial magnets are given below:

1. Natural magnets are not so strong. So, artificial magnets are used. It’s also because we can increase the strength of magnetization of artificial magnets or we can make them very strong.

2. Artificial magnets are irregular in shape, so they can be moulded into our desired shape.

Q3: A small iron bar is brought near the N-pole of a bar magnet. How does the iron bar gain magnetism? Draw a diagram to show the polarity on the iron bar. What will happen if the magnet is moved away?

Ans: The bar acquires a temporary magnetism. The polarity on the iron bar is described below:

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After the magnet is moved away, iron fillings lose its magnetic attribute.

Q4: Write four properties of Magnetic Field Lines.

Ans: The four properties of magnetic field lines are:

1. Lines of the magnetic field are closed and continuous curves.

2. They are directed from N-pole and towards the S-pole outside the magnet.

3. The tangent to any point on these lines gives the direction of the magnetic field (B) at that point.

4. Two field lines never intersect each other.

Q5: State two proofs/evidence of the existence of Earth’s magnetic field.

Ans: Two facts prove the existence of Earth’s magnetic field. They are:

1. A freely hung magnetic needle always rests in geographical North-South direction.

2. We can get neutral points by plotting field lines of a magnet.

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