Question 8 ā€” Lifting magnet stops lifting - Questions at the end of the chapter - Chapter 4 Class 8 - Electricity: Magnetic & Heating Effects(Curiosity)

Last updated at July 13, 2026 by

Q 8
Question

Sumana forgets to switch off her lifting electromagnet. After some time, the nail no longer picks up clips, but the wire is still warm. Why did the lifting electromagnet stop lifting the clips? Give possible reasons.

šŸ”— Concept: 4.1.2 Lifting Electromagnets

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The cell has run down, so the magnetic field became too weak to hold the clips.

Explanation

  • The switch was left ON, so current flowed for a long time.
  • This used up the cell, so it became weak or dead.
  • A weak current makes a weak magnetic field, so the clips fall.
  • The wire is still warm from the heating effect of the current.
A run-down cell gives a weak field, so lifting stops.
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