Calculate the magnetic field a point 10 cm from a North pole of strength 10 A-m.
`(mu_(0)=4pixx10^(-7)N-A^(-2))`

Explanation

Given, `d=10cm=0.1m`,
`m=10A-m`,
`mu_(0)=4pixx10^(-7)N-A^(2)`
and `B=?`
`therefore` Magnetic field due to an isolated magnetic dipole,
`B=(mu)/(4pi).(m)/(r^(2))=10^(-7)xx(10)/((0.1)^(2))=10^(-4)Wbm^(-2)`