The magnetic moment produced in a substance of `1 gm is 6xx10^(-7) "ampere","metre"^(2)`. If its density is `5 gm//cm^(3)`, then the intensity of magnetisation in `A//m` will be

Options

A. `8.3xx10^(6)`
B. 3
C. `1.2xx10^(-7)`
D. `3xx10^(-6)`

Answer

2

Explanation

`I=M/V=M/mass//density`
Given Mass = 1gm=`10^(-3)`kg
and density=`5gm//cm^(3)=5xx410^(-3)kg/(10^(-2))^(3) m^(3)=5xx10^(3) Kg//m^(3)`
Hence`I=6xx10^(-7)xx5xx10^(3)/10^(-3)=3`