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(A) The magnetic field inside a current-carrying solenoid is given by $B_0 = \mu_0 n I$. When a ferromagnetic material is inserted into the solenoid,i

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Largely increases

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(A) The magnetic field inside a current-carrying solenoid is given by $B_0 = \mu_0 n I$. When a ferromagnetic material is inserted into the solenoid,it gets strongly magnetized in the direction of the applied magnetic field. The total magnetic field $B$ becomes $B = B_0 + B_m$,where $B_m$ is the magnetic field due to the magnetization of the material. Since the relative permeability $\mu_r$ of a ferromagnetic material is very large (much greater than $1$),the magnetic field inside the solenoid increases significantly (largely).

If a ferromagnetic material is inserted in a current-carrying solenoid,the magnetic field of the solenoid

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