How is the magnetic field due to a solenoid carrying current affected if a soft iron bar is introduced inside the solenoid?

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How is the magnetic field due to a solenoid carrying current affected if a soft iron bar is introduced inside the solenoid?

Class 10 | Electro Magnetism | ICSE | Physics | Selina

How is the magnetic field due to a solenoid carrying current affected if a soft iron bar is introduced inside the solenoid?

Solution:

When a soft iron bar is placed within the solenoid, the magnetic field increases.

Explanation :

The soft iron core aids in concentrating magnetic lines of force through the solenoid, resulting in a nearly uniform magnetic field at the core’s end face. The magnetic lines of forces begin to diverge in the absence of a core, curving sharply outside the coils. The stronger the magnetic created in the core, the narrower the distance between the coils and the core. As a result, the most effective electromagnets have coils tightly twisted around the core.

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