question_answer 82)

  A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because.......... (a) all the domains get oriented in the direction of magnetic field (b) all the domains get oriented in the direction opposite to the direction of magnetic field (c) domains get oriented randomly (d) domains are not affected by magnetic field

Answer:

                  (a) When a ferromagnetic substance is placed in a. magnetic field it becomes a permanent magnet because all the domains get oriented in the direction of magnetic field even after removal of applied magnetic field.