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Distinguish between paramagnetic and diamagnetic substances. A magnetising field of 1500A/m produces a flux of 2.4 x10-5 weber in a bar of iron of cross-sectional area 0.5cm2. Calculate the permeability and susceptibility of the iron-bar used.

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Distinction between diamagnetic, paramagnetic and ferromagnetic substances

Property Diamagnetic  Paramagnetic
(i) Susceptibility (x)  -1 ≤  x < 0 (negative and small) 0 < x < ε (positive and small)                                                                                                      
(ii)                             Permeability (μr)                                                                       0 μr <1(less than 1)                                                                                                                                                                   1 < μr < 1 + ε (slightly greater than 1)                                                                           
(iii)                                                      Coercivity Example                                                                                          High Gold Low Platinum

The magnetic field lines near a diamagnetic substance and a paramagnetic substance are shown below: 

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