Question

A small hole is made at the centre of the magnet then its magnetic moment is

Answer 1

Answer:

Decreased. Or "decreases".

Explanation:

WHY?

Considering that our intensity of magnetisation is equal to magnetic movement developed per unit over volume,

We can say that:      (I =  M/V )

Our intensity of magnetisation is constant, so we can find the new formula,

(M= I x V)

We will find that our volume is decreasing when a hole is created in the  center. Now because, the volume decreased, our magnetisation also decreases.