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NEET2007PhysicsMagnetic Properties of MatterActual

Assertion : Ferro magnetic substances become paramagnetic above Curie temperature. Reason : Domains are destroyed at high temperature.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion

Step-by-step solution

The assertion is true. From Curie Weiss law where the susceptibility ( = C (T- _C ) ). If the temperature rises above the Curie temperature ( _C ), ferromagnetic materials become paramagnetic materials because the domains get destroyed as stated.

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