Relative permeability of a substance is 0.075. Its magnetic susceptibility is ........

Options

A. `0.925`
B. `-0.925`
C. `1.075`
D. `-1.075`

Answer

B

Explanation

Relative permeability
`mu_(r) = 1 + chi_(m)` but `mu_(r) = K_(m)`
`therefore K_(m) = 1+ chi_(m)`
`therefore chi_(m) = K_(m) - 1 = 0.075 -1 `
`therefore chi_(m) = -0.925`