The susceptibility of annealed iron at saturation is 5500. Find the permeability of annealed iron at saturation.

Options

A. `7 xx 10^(-3) T mA^(-1)`
B. `6.9 xx 10^(-3) T mA^(-1)`
C. `3.2 xx 10^(-3) T mA^(-1)`
D. `2 xx 10^(-4) T mA^(-1)`

Answer

B

Explanation

`mu= 1+ chi_(m) rArr 1 + 5500 = 5501`
`mu = mu_(theta)mu_(r) = 4pi xx 10^(-7) xx 5501`
`mu = 6.9 xx 10^(-3) T mA^(-1)`