# Out of the Two Magnetic Materials, 'A' Has Relative Permeability Slightly Greater than Unity While 'B' Has Less than Unity. Identify the Nature of the Materials 'A' and 'B'. - Physics

Out of the two magnetic materials, 'A' has relative permeability slightly greater than unity while 'B' has less than unity. Identify the nature of the materials 'A' and 'B'. Will their susceptibilities be positive or negative?

#### Solution

For a paramagnetic material, the relative permeability lies between 1<μr<1+ε and its susceptibility lies between 0<chi<ε.

Hence, 'A' is a paramagnetic material and its susceptibility is positive. This is because its relative permeability is slightly greater than unity.

For a diamagnetic material, the relative permeability lies between 0μr<1 and its susceptibility lies between 1<chi<0.

Hence, 'B' is a diamagnetic material and its susceptibility is negative. This is because its relative permeability is less than unity.

Here, μr and chi refer to the relative permeability and susceptibility.

Concept: Magnetic Properties of Materials
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2013-2014 (March) Delhi Set 1

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