1.

Magnetic field and magnetic intensity are 1 T and 150 "Am"^(-1) respectively in a iron core, then its relative permeability is ....... (Take mu_(0) = 4pi xx 10^(-7) mu m^(-1) )

Answer»

`(10^(6) )/(4pi)`
`(10^3)/( 4pi)`
`(10^3)/( 6 pi)`
`(10^5)/( 6 pi)`

Solution :`B= muH`
`therefore B = mu_(0) mu_(r) H`
`therefore _(r) = (B)/( mu_(0) H)`
`= (1)/( 4 XX pi xx 10^(-7)xx 150) `
`= (10^5)/( 6 pi) mu m^(-1)`


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