If a ferromagnetic material is inserted in a current carrying solenoid, the magnetic field inside the solenoid
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → increases
Inside a solenoid filled with a material, \( B = \mu_0\mu_r nI \). A ferromagnetic material has a very large relative permeability (\( \mu_r \gg 1 \), often hundreds or thousands), because its domains line up with the applied field and add a strong magnetisation of their own. So the field inside the solenoid increases greatly.
Note: A similar question was also asked in CUET (UG) 2026 on 25-05-2026 (Slot 1).
NCERT (2026-27):
The Solenoid – “… The direction of the field is given by the right-hand rule. The solenoid is commonly used to obtain a uniform magnetic field. We shall see in the next chapter that a large field is possible by inserting a soft iron core inside the solenoid.”