Question

If the magnetizing field on a ferromagnetic material is increased, its permeability
A. Decreased
B. Increased
C. Is unaffected
D. May be increased or decreased

Answer 1

Hint: When we place a nonmagnetic material which can be magnetized in an external magnetic field then there will be magnetic property induced in it. One noticeable thing over here is the amount of magnetic strength induced will be greater than the original applied magnetic field. That means the magnetism induction (B) in that material depends upon the intensity of magnetic field(H) and intensity of magnetization(I).

Formula used:
$B = \mu H$

Complete step by step answer:
In electrostatics basically there are different ways of charging like direct contact and induction. In case of direct contact we bring the charged particle near the uncharged particle and due to the potential difference the charge will be transferred from the charged body to the uncharged body. In this manner we can charge the uncharged body. The other way to charge is induction. Here we don’t touch the charged body with the uncharged body but we bring both bodies closer so that opposite charge will be induced on the uncharged body and if we earth the uncharged body and move the charged body farther then the charge remains on the uncharged body even after we unearth it. So this is also the way of charging.
Same methods can be followed to induce the magnetism in the unmagnetized body.
This question is also related to induction of magnetism in ferromagnetic material by applying an external magnetic field. The magnetic flux density in the ferromagnetic material is given by
$B = \mu H$
Where $\mu $ is the magnetic permeability which depends on susceptibility. Now as H increases to maintain B constant $\mu $will decrease.

So, the correct answer is “Option A”.

Note:
As far as magnetism is considered, there are three kinds of magnetic materials, diamagnetic and paramagnetic and ferromagnetic. The reason why we had given about intensity of magnetization in the hint is because magnetic susceptibility which influences magnetic permeability depends on intensity of magnetization(I) and magnetic field intensity(H).