A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2   m ,   100 turns,…

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is:
  1. 285 A/m
  2. 2600 A/m
  3. 520 A/m
  4. 1200 A/m

Solution

Coercivity =nI=1000.2×5.2  A/m

=2600 A/m

Asked in: JEE Main 2019 (09 Jan Shift 1)

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