NCERT Class 8 Science Curiosity (Sanskrit): Chapter 4 — अध्यायः ४ विद्युत् - चुम्बकियः तापीय प्रभावः
This chapter, "विद्युत्प्रवाहस्य चुम्बकीयप्रभावः" (Magnetic Effects of Electric Current) from NCERT's Class 8 Science Curiosity textbook, explores the fascinating relationship between electricity and magnetism. It begins by posing questions about detecting electric current without a bulb, creating temporary magnets, and understanding heat generation in electrical devices. The chapter introduces the concept of an electromagnet through a demonstration of an iron nail wrapped with wire, connected to a battery, attracting iron filings. It then details an activity (Kriyākalāpa 4) to investigate the magnetic effect of electric current using a compass, battery, pins, and wire. This chapter aims to help students understand fundamental principles of electromagnetism, crucial for their CBSE science learning.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 8 |
| Subject | Science |
| Book | Curiosity (Sanskrit) |
| Chapter | Chapter 4 — अध्यायः ४ विद्युत् - चुम्बकियः तापीय प्रभावः |
| Language | Sanskrit |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 239 |
Learning outcomes
- Understand that electric current produces a magnetic field.
- Learn how to create a temporary magnet (electromagnet).
- Investigate the magnetic effect of electric current using a compass.
- Identify components of a simple electric circuit.
Vocabulary
| Word | Meaning |
|---|---|
| विद्युत्-चुम्बकम् | Electromagnet |
| विद्युत्-परिTपथः | Electric circuit |
| विद्युत्-कोशः | Electric cell/battery |
| चुम्बकीय-दिKक्सूचकम् | Magnetic compass |
| लौह-नखः | Iron nail |
| लौहपत्राणि | Iron filings/sheets |
| आकर्षः | Akash (a character name) |
| मोहिनी | Mohini (a character name) |
| सुमना | Sumana (a character name) |
| भारोत्तलक | Lifting/carrying (as in electromagnet) |
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Practice questions
- What is an electromagnet? Answer: An electromagnet is a temporary magnet created by passing an electric current through a coil of wire wrapped around a magnetic material like an iron nail.
- How can you detect the presence of electric current in a circuit without a bulb? Answer: You can use a magnetic compass. If the compass needle deflects when placed near the circuit, it indicates the presence of electric current.
- What materials are attracted by an electromagnet? Answer: Electromagnets attract magnetic materials, primarily iron and its alloys.
Frequently asked questions
What is the main topic of NCERT Class 8 Science Curiosity Chapter 4?
Chapter 4 discusses the magnetic effects of electric current and how to create an electromagnet.
What is an electromagnet?
An electromagnet is a magnet created by electric current flowing through a coil of wire wrapped around a core, like an iron nail.
How does an electromagnet work?
When electric current flows through the coil, it generates a magnetic field that magnetizes the core, making it act like a magnet.
What materials can an electromagnet attract?
Electromagnets attract ferromagnetic materials, such as iron, nickel, and cobalt.
What is the purpose of the magnetic compass in the experiment?
The magnetic compass is used to detect the magnetic field produced by the electric current flowing in the wire.
Can electromagnets be turned on and off?
Yes, electromagnets can be turned on and off by controlling the flow of electric current.
Related resources
Important topics
Topics covered
NCERT Class 8 Science — Curiosity (Sanskrit) — Chapter 4 — अध्यायः ४ विद्युत् - चुम्बकियः तापीय प्रभावः. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.