Question

Assertion: Magnetic susceptibillity is a pure number.

Reason : The value of magnetic susceptibility for vacuum is one.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (c) A is true but R is false

Explanation:

Magnetic  susceptibillity (X_m) is defined as the ratio of the intensity (M) of magnetisation to the magnetic intensity (H) of the  magnetising field. that is

X_m = M/H

It is a pure number, because I and H have the same unit. Its value for vacuum is zero as there can be no magnetisation in vacuum.