Question

The magnetic susceptibility of a substance at room temperature is -0.0002. The susceptibility when the temperature is increased by 2°C, will be


-0.0001

0.0002

-0.0002

0.0005​

Answer 1

Answer:

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Explanation:

0.0002

Answer 2

Answer:

The Magnetic susceptibility when the temperature is increased by 2°C, will be equals to option C, -0.0002

Explanation:

To answer this question we first need to see what exactly is magnetic susceptibility.

It is a measure of how much the material will become magnetized in an applied magnetic field. Symbolically it is denoted by the symbol χ. This allows a simple classification, an alignment with the magnetic field, χ > 0, are called para magnetism and an alignment against the field, χ < 0, called diamagnetism.

There are other types of materials as well ,for example ferromagnetic and ferrimagnetic materials but in this question we observe that the susceptibility is negative(-0.0002) so that means that the material is a diamagnetic material (for which χ < 0).

So let us discuss the dependence of Temperature on diamagnetic materials.

Diamagnetic materials have their magnetic moment due to spin so there is no net dipole moment due to orbital motion of electrons. In any material where the dipole moment is due to orbital motion of electrons,  we note that many dipoles cling together in same orientation.

In the absence of external magnetic field the domains of most materials are randomly oriented such that the net dipole moment at any finite volume is zero, it is only when they are exposed to external magnetic field that their diploe try to align in the the direction of external magnetic field but thermal motion try to misalign them so their is a fight between external magnetic field which try to align them and thermal motion due to temperature that wants to misalign them, hence their net magnetic field or permeability is affected by temperature. Such is the case with paramagnetic materials and ( ferromagnetic materials) in which rise in temperature decreases their net magnetism ,according to  curie law.

Diamagnetic materials got their magnetism not due to orbital motion of electrons but due to spin, so no formation of domains which could be misaligned by thermal motion exists ,so their magnetism is independent of temperature.

Hence temperature has no effect on the magnetic behavior of diamagnetic substance.

Hence the answer is option (C) -0.0002