Question 11 — Four coils of different metals - Questions at the end of the chapter - Chapter 4 Class 8 - Electricity: Magnetic & Heating Effects(Curiosity)

Last updated at June 5, 2026 by

Q 11
Question

Four coils of similar shape and size are made from iron, copper, aluminium, and nichrome (Fig. 4.12), each connected to a cell. When current passes, near which coils will a compass needle deflect?

  • (i) Only in circuit (a)
  • (ii) Only in circuits (a) and (b)
  • (iii) Only in circuits (a), (b), and (c)
  • (iv) In all four circuits

🔗 Concept: 4.1 Does an Electric Current Have a Magnetic Effect?

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(iv) In all four circuits.

Explanation

  • All four metals are conductors, so current flows in each coil.
  • Any current carrying coil makes a magnetic field.
  • So the compass deflects near every coil.
  • The metal only changes how strong the effect is, not whether it happens.
Every current carrying coil deflects a nearby compass.
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