The thirteenth chapter in Science textbook is 'Magnetic Effects of Electric Current'.
Magnet
Magnet is an object that attracts objects made of iron, cobalt and nickle. Magnet comes to rest in North – South direction, when suspended freely.
Use of Magnets
Magnets are used
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in refrigerators.
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in radio and stereo speakers.
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in audio and video cassette players.
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in children’s toys and;
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on hard discs and floppies of computers.
Properties of Magnet
- A free suspended magnet always points towards the north and south direction.
- The pole of a magnet which points toward north direction is called north pole or north-seeking.
- The pole of a magnet which points toward south direction is called south pole or south seeking.
- Like poles of magnets repel each other while unlike poles of magnets attract each other.
Magnetic field and field lines
The influence of force surrounding a magnet is called magnetic field. In the magnetic field, the force exerted by a magnet can be detected using a compass or any other magnet. The magnetic field is represented by magnetic field lines.
The topics discussed in this chapter are as follows:
- Field and field lines
- Magnetic field due to a current carrying conductor
- Magnetic field due to a straight current carrying conductor
- Right hand thumb rule
- Magnetic field due to current through a circular loop
- Magnetic field due to current in a solenoid
- Force on a Current Carrying Conductor in a Magnetic Field
- Fleming's left hand rule
- Electromagnetic Induction and Electric Generators
- Domestic electric circuits
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NCERT Solutions for Chapter 13: Magnetic Effects of Electric Current
Also Check
Chapter 1: Chemical Reactions and Equations
Chapter 2: Acids, Bases and Salts
Chapter 3: Metals and Non-Metals
Chapter 4: Carbon and its compounds
Chapter 5: Periodic Classification of Elements
Chapter 6: Life Processes
Chapter 7: Control and Coordination
Chapter 8: How do organisms reproduce?
Chapter 9: Heredity and Evolution
Chapter 10: Light - Reflection and Refraction
Chapter 11: The Human Eye and the Colourful World
Chapter 12: Electricity
Chapter 14: Sources of Energy
Chapter 15: Our Environment
Chapter 16: Sustainable Management of Natural Resources
Check out Frequently Asked Questions (FAQs) for Chapter 13: Magnetic Effects of Electric Current
What is a solenoid?
A solenoid is a long cylindrical conductor coil, having a large number of turns of insulated copper wire.
What is a magnetic field?
The region around a magnet, in which the magnetic force of attraction and repulsion is felt, is called a magnetic field.
Which effect of electric current is utilized in the working of an electric fuse?
An electric fuse works on the heating effect of current.
What is the cause of earth’s magnetism?
Earth’s magnetism is due to the magnetic effect of current which is flowing in the liquid core at the center of the earth.
What will you do if you see a person coming in contact with a live wire?
Such a person should be provided with an insulated support of wood, plastic or rubber.