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ICSE Class 10 Physics Question 31 of 136

Electro-magnetism — Question 10

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Question

Question 10

What is an electromagnet? Name two factors on which the strength of magnetic field of an electromagnet depends and state how does it depend on the factors stated by you.

Answer

An electromagnet is a temporary strong magnet made by passing current in a coil wound around a piece of soft iron. It is an artificial magnet.

The strength of magnetic field of an electromagnet depends on —

  1. Number of turns — By increasing the number of turns of windings in the solenoid, the strength of magnetic field of an electromagnet can be increased.
  2. Current — By increasing the current through the solenoid, the strength of magnetic field can be increased.