1. Tardigrade
  2. Question
  3. Physics
  4. Assertion Substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets. Reason Permanent magnet can be made by placing a ferromagnetic rod a solenoid and passing current through it.

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Q. Assertion Substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets.
Reason Permanent magnet can be made by placing a ferromagnetic rod a solenoid and passing current through it.

Magnetism and Matter

Solution:

Correct answer is (b) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.