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Question

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

A
2600 A/m
B
285 A/m
C
520 A/m
D
1200 A/m
Solution
Verified by Toppr

Given:Length of solenoid l = 0.2 m
No. of turns N = 100
Current I = 5.2 A
To find : Coercivity of bar magnet H

Solution :
Coercivity of bar magnet H = nI
Now, n = Nl
Therefore, H = Nl×I = 1000.2×5.2 = 26×100 = 2600
H = 2600 A/m

Hence A is the correct option

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