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a bar magnet is demagnetised by inserting it inside a solenoid of length 0.2m, 100 turns and carrying a current of 5.2A. the coercivity of the bar magnet is


Pankajkumaryadav 16th Sep, 2019
Answer (1)
Mayank Chowdhary 11th Feb, 2020

Intensity of magnetising field - in which

SI unit is A/m

In CGS - Oersted

H = B/u

You can get the answer using the following formulas..

Therefore the answer after substitution comes out to be 2600 A/m.

These are some of the basic easy questions which you need to master upon if you aim to appear for competetive entrance examinations like JEE MAINS, NEET, CET, etc,

Best wishes. Thankyou.

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