Physics
Grade-10
Easy

Question

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:

  1. Will decrease
  2. Will increase
  3. Will become zero
  4. Will remain the same

hintHint:

  • This soft iron core helps to concentrate all the magnetic lines of forces through the solenoid so that the magnetic field is uniform at the cross section of the core.

The correct answer is: Will increase


    • When a soft iron rod also known as the core is inserted inside a solenoid then the strength of the magnetic field increases because the iron ore gets magnetized due to magnetic induction and this combination of the solenoid and the soft iron core is called an electromagnet
    • This soft iron core helps to concentrate all the magnetic lines of forces through the solenoid so that the magnetic field is uniform at the cross section of the core.
    • Hence we can say when an iron core is inserted in a coil carrying current, the strength of its magnetic field will increase.

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