Selina solutions for class 9 Chapter 10 Magnetism supplies students with a complete guide to all the ICSE Class 9 textbook questions. Students through the solutions can perceive information which is crucial not only from an understanding perspective for examinations but also lays a foundation for analyzing capabilities of students of class 9 who would soon be entering the next academic year, i.e., class 10.
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Selina Solutions for class 9 Physics Chapter 10 – Magnetism
ICSE Class 9 Physics Chapter 10 Magnetism is organized as the last chapter in the textbook. As the name suggests, magnetism is the property exhibited by a magnet or a substance possessing properties of a magnet. It is a phenomenon generated through the motion of electric charges which either attracts or repels objects.
The chapter briefly introduces students with the concept of magnetism through lodestone, natural magnets, induced magnetism. Induced magnetism is the temporary acquisition of magnetic properties due to the presence of a magnet in the vicinity and the process is known as magnetic induction.
Students are also enlightened about lines of magnetic field, its properties and the concept of the magnetic field of the earth.
The later part of the chapter discusses electromagnet and its applications, permanent magnets, comparison of an electromagnet with a permanent magnet and related topics.
List of subtopics covered in Chapter 10 – Magnetism
| Number | Subtopic |
| 10.1 | Introduction |
| 10.2 | Induced magnetism |
| 10.3 | Lines of magnetic field |
| 10.4 | Properties of magnetic field lines |
| 10.5 | Magnetic field of earth |
| 10.6 | Plotting of uniform magnetic field lines of earth |
| 10.7 | Plotting of non-uniform magnetic field of a strong bar magnet and neutral points |
| 10.8 | Neutral points |
| 10.9 | Electromagnet |
| 10.10 | Permanent magnet |
| 10.11 | Comparison of an electromagnet magnet with a permanent magnet |
| 10.12 | Advantages of an electromagnet over a permanent magnet |
| 10.13 | Uses of electromagnets |
List of Exercise
| Name of the exercise | Number of questions | Page number |
| Exercise-10A | 30 | 208 |
| Exercise-10B | 16 | 211 |
Selina Solutions for class 9 Physics Chapter 10 – Magnetism
Class 9 students through this chapter are presented with ample information about magnetism and the various concepts revolving around it. Induced magnetism is the property of acquiring temporary magnetism by a magnetic material that is kept near a magnet, the process is referred to as magnetic induction.
Students are briefed about the lines of a magnetic field, the concept is provided with properties for better understanding of the concept. It also explains the evidence of the existence of the earth’s magnetic field through various facts.
Neutral points are the points at which two magnetic fields are equal in magnitude but opposite in direction. The last part of the chapter discusses electromagnets and its uses, the two shapes of electromagnets, their construction etc. Permanent magnets, along with a comparison with electromagnets is also elucidated.
Key Features of Selina Solutions for class 9 Physics 10 – Magnetism
- Content is framed in an easy-to-learn format
- Selina solutions documented by in-house experts for the respective subjects
- Numericals solved accurately along with complete explanation
- Clear depiction of information through diagrams
- Solutions composed from information presented in the textbook
Frequently Asked Questions on Magnetism?
What is a lodestone?
Lodestone is the first known magnet which is an ore of iron oxide (Fe3O4) found in large quantities in Magnesia, in Asia Minor. It was found to possess two properties:
- It attracts small pieces of iron, and
- It sets itself along a definite direction when it is suspended freely
What is an artificial magnet?
It is a magnetized piece of iron or any other magnetic material. We need artificial magnets because of the following two reasons:
- Natural magnets are not very strong magnetically, artificial magnets can be made strong
- Natural magnets occur in odd and irregular shapes, artificial magnets, on the other hand, can be given desired shapes.
Explain the term induced magnetism?
It is the temporary magnetism acquired by a magnetic material when it is placed near a magnet.
When an unmagnetized bar of a magnetic material is placed near a magnet, the bar turns into a magnet. It acquires the property of attracting iron fillings when brought near its ends. The bar tends to lose its magnetism when the magnet is removed.
What do you understand by the term magnetic field lines?
A magnetic field line is a continuous curve in a magnetic field such that tangent at any point of it gives the direction of the magnetic field at that point.
What is a neural point?
Neutral points are the points at which two magnetic fields are equal in magnitude, but opposite in direction. The net magnetic field at a neutral point is zero. When a compass needle is placed at the neutral point, it will come to rest in any direction, hence the position of a neutral point can be detected with the help of a compass.
What is an electromagnet?
An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet.
Name the material used for preparing an electromagnet?
The material used for preparing an electromagnet is a piece of soft iron.
Name one device that uses an electromagnet?
A device that uses an electromagnet is a loudspeaker.
Electromagnets are made up of?
Soft iron – can obtain magnetic properties when current flows through the solenoid.
