The space within a current carrying toroid is filled with magnesium `(X=1.2 xx 10^(-5))` . The percentage increase in magnetic field B is `Nxx10^(-3)` %. The value of N is

Answer

`1.2`

Explanation

Here, `X = 1.2 xx 10^(-5)`
From `B = mu_(0) (H+I)`
`implies B -B_0=B_0x`
`implies (B-B_0)/(B_0)=x`
`implies (B-B_0)/(B_0)=100=100xx x `
`= 100 xx1.2 xx10^(-5)`
`=1.2 xx10^(-3)%`