Saniya wants to magnetize an iron strip using a bar magnet by the single-touch method. Which action must she…

Saniya wants to magnetize an iron strip using a bar magnet by the single-touch method. Which action must she AVOID during the process?
  1. Moving the magnet from one end of the strip to the other in a straight line
  2. Lifting the bar magnet at the end of each stroke
  3. Rubbing the bar magnet back and forth along the strip
  4. Using the same magnetic pole for every stroke

Solution

Rubbing the magnet back and forth disturbs the alignment of tiny magnetic domains; stroking must always be in one continuous single direction.

Asked in: Homi Bhabha Practice

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