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ICSE Class 10 Physics Question 17 of 136

Electro-magnetism — Question 7

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7
Question

Question 7

Which of the following statements is not true for an electromagnet ?

  1. It is made of soft iron.
  2. Its magnetic field strength can be changed.
  3. The polarity of an electromagnet cannot be changed.
  4. It can easily be demagnetised.
Answer

The polarity of an electromagnet cannot be changed

Reason — The polarity of an electromagnet can be reversed by reversing the direction of current in its solenoid.