First slide
Magnetism
Question

Two short bar magnets of magnetic moments  0.125Am2 and  0.512Am2  are placed with their like poles facing each other. If the distance between the centres of the magnet is 0.26m , the distance of neutral point from the weaker bar magnet is --------------

Moderate
Solution

Let say the Null point distance from the weaker pole is x

                                              To find null point, Baxial of both magnets should cancel out each other.μo4π2M1(x)3=μo4π2M2(0.26-x)3Now put, M1=0.125Am2M2=0.512Am2 

0.125(x)3=0.512(0.26-x)3 5x=80.26-x x=0.1 m

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