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NCERT Solutions for Curiosity Chapter 4 Electricity: Magnetic and Heating Effects

Updated on 2026-09-05

About this chapter

When an electric current flows through a conductor such as a wire, it produces a magnetic field around it. This is the magnetic effect of electric current , and it is why a compass needle placed under a current carrying wire is deflected. Stop the current and the field disappears at once. A current carrying coil that behaves as a magnet is called an electromagnet . Every turn of the coil makes its own magnetic field, and because all the turns are wound the same way these fields point the same way inside the coil and add up — so a coil of 50 turns is far stronger than a single straight wire. An electromagnet has a North and a South pole , just like a bar magnet. Its strength is increased by increasing the current (more cells) or the number of turns , and its poles are reversed by reversing

  • Chapter opener
  • Electromagnets
  • –50Section 4.1.1 Electromagnets
  • –51Section 4.1.1 Electromagnets
  • The Earth as a magnet
  • Sections 4.1.2 and 4.2
  • –53Section 4.2 Does a Current Carrying Wire Get Hot?
  • Does a Current Carrying Wire Get Hot?
  • How Does a Battery Generate Electricity?
  • Voltaic cell
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Exercises

  1. Chapter opener — Probe and ponder Page 46
  2. –48Section 4.1 Does an Electric Current Have a Magnetic Effect? — Activity 4.1: Let us investigate Page 47
  3. In-text Questions — Electromagnets Page 49
  4. Activity 4.2: Let us explore — Electromagnets Page 49
  5. –50Section 4.1.1 Electromagnets — Activity 4.3: Let us experiment Page 49
  6. In-text Questions — Electromagnets Page 50
  7. –51Section 4.1.1 Electromagnets — Activity 4.4: Let us investigate Page 50
  8. Think like a scientist — Electromagnets Page 51
  9. The Earth as a magnet — A step further Page 51
  10. Sections 4.1.2 and 4.2 — In-text Questions Page 52
  11. –53Section 4.2 Does a Current Carrying Wire Get Hot? — Activity 4.5: Let us observe Page 52
  12. Think like a scientist — Does a Current Carrying Wire Get Hot? Page 53
  13. In-text Questions — How Does a Battery Generate Electricity? Page 55 & 56
  14. Activity 4.6: Let us construct — Voltaic cell Page 56
  15. –61End-of-chapter questions — Keep the curiosity alive Page 58
  16. Science, Society and Interdisciplinary Projects — Discover, design, and debate Page 61
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