Question

Short bar magnet is placed with its n polepointing south

Answer 1

Solution :

Here, d=10cm=0⋅1m, H=0⋅4gauss=0⋅4×10−4T, M=?

Neutral points in this case, lie on axial line of magnet, such that μ04π2Md3=H

∴10−7×2M(0⋅1)3=0⋅4×10−4 or