A long bar magnet has a pole strength of `10 Am`. Find the magnetic field at a point on the axis of the magnet at a distance of 5cm from the north pole of the magnet.

Explanation

`M = 10Am`
`d = 5 cm= 0.05m`
`B = (mu_(0))/(4 pi)(M)/( r^(2))`
`= (10^(-7)xx 10)/(5 xx10^(-2))^(2)) = (10^(-6))/(25 xx 10^(-4))`
`= (10^(-2))/(25)= 4 xx 10^(-4)Tesla `