Choose the right answer from the following

A constant current I is maintained in a solenoid. Which of the following quantities will not increase if an iron rod is inserted in the solenoid along its axis?

  1. the magnetic field at the centre
  2. self-inductance of the solenoid
  3. magnetic flux linked with the solenoid
  4. rate of Joule heating.

Answer: rate of joule heating

Explanation: When an iron rod is inserted inside a solenoid the magnetic field inside the solenoid increases due to the high magnetic permeability of iron. Due to the increased magnetic field, the magnetic flux also increases. TheĀ self-inductance of the solenoid also increases because self-inductance (L) of the coil is directly proportional to the permeability of the material inside the solenoid. The rate of joule heating doesn’t change.

 

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