Question

Which of the following statements are correct ?
(i) An electromagnet produces a permanent magnetic field.
(ii) An electromagnet can produce a strong magnetic field.
(iii) The polarity of electromagnet can be reversed by reversing the direction of current in the solenoid.
(a) all of the above
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (i) and (iii)

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Answer

(c) (ii) and (iii)

Reason — The correct statements for an electromagnet are :

  1. An electromagnet can produce a strong magnetic field.
  2. The polarity of electromagnet can be reversed by reversing the direction of current in the solenoid.

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