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A bar magnet of moment M and pole streng...

A bar magnet of moment M and pole strength m is cut into parts of equal lengths. The magetic moment and pole strength of either part is

A

`(M)/(2),(m)/(2)`

B

`M,(m)/(2)`

C

`(M)/(2),m`

D

M,n

Text Solution

Verified by Experts

The correct Answer is:
C
The bar magnet is shown in the diagram For fig (a) and (b)

Magnetic moment for (a) is M=M(2l)=magnetic moment Mgnetic moment for (b) is of the first
`(d) " " M'=m'(l)`
` Now," " (M')/(M)=(m'(l))/(m'(2l))=(1)/(2)((m')/(m)).....(i)`
When magnet is cut as shown in the diagram, pole strength wil not be affected, Hence, m'=m
`Rightarrow (m')/(m)=1 RightarrowM'=(M)/(2) " " "[""form" Eq.(i)"]"`
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