Rohan magnetizes a steel sewing needle by sliding the North pole of a bar magnet along it from end P to end…

Rohan magnetizes a steel sewing needle by sliding the North pole of a bar magnet along it from end P to end Q repeatedly in one direction. Which magnetic pole will be developed at end Q of the needle?
  1. North pole
  2. South pole
  3. No pole
  4. Alternating pole

Solution

In the single-touch method, the end where the stroking pole leaves the bar (end Q) acquires the opposite polarity to that of the stroking pole (South pole).

Asked in: Homi Bhabha Practice

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