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:

A

2600 A/m

B

520 A/m

C

285 A/m

D

1200 A/m

Hard
Updated on : 2022-09-05
Solution
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Correct option is A)

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

Coercivity of bar magnet H = nI
 Now, n =
Therefore, H = = = 26 = 2600
H = 2600 A/m

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