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RRB NTPC 2017 · Question 450 of 1076

Which one is NOT true with electromagnets?

  1. AIt is a temporary magnet.
  2. BIts strength varies with the air gap between its poles.
  3. CPolarity cannot be changed.Correct
  4. DIts strength can be changed.

Answer: C. Polarity cannot be changed.

Official answer key verified. Detailed explanation coming soon.

Source: RRB NTPC Tier-2 (CEN 03/2015) 17-Jan-2017 Shift-2 — solved paper with answer key · reliable-secondary

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