Which of the following is true regarding dimagnetic substances (symbols have their usual meaning)

Options

A. `mu gt 1, chi_(m) gt 1`
B. `mu_(r) gt 1, chi_(m) lt 1`
C. `mu_(r) gt 1, chi_(m) lt 0`
D. `mu lt 1, chi_(m) gt 0`

Answer

C

Explanation

Relative magnetic permeability of diamagnetic substances is always less than unity.
i.e. ` mu _ r lt 1 `
` mu _ r = ( 1 + chi _ m ) as mu _ r lt 1, chi _ m ` is negative.
Hence , susceptibility of diamagnetic substances has a small negative value.