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KCET2019PhysicsMagnetic Properties of Matter

Coersivity of a magnet where the ferromagnet gets completely demagnetized is ( 3 10³ Am ⁻¹ ) The minimum current required to be passed in a solenoid having ( 1000 ) turns per metre, so that the magnet gets completely demagnetized when placed inside the solenoid is

Options

  1. A( 3 ~A )
  2. B( 30 ~mA )
  3. C( 6 ~A )
  4. D( 60 ~mA )

Correct answer

A. ( 3 ~A )

Step-by-step solution

(A) ( H=n l ) ( I= H n = 3 10³ 1000 =3 ~A )

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