Question

what is hysteresis loop.?
Give Note on electron theory of paramagnetism ?

Answer 1

ur answer is above given

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Answer 2

$\Large\underline\mathfrak{Question}$

What is hysteresis loop.?
Give Note on electron theory of paramagnetism ?

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$\Large\bold\star\underline{\underline\textbf{Hysteresis Loop\:}}$

( see the provided diagram also ( given with the answer)

→ Hysteresis loop is the B-H curve for ferromagnetic materials. It gives the idea about the retentivity of ferromagnetic materials. Hysteresis loop for ferromagnetic material is shown in the given picture (with this answer). Curve abcdefa is known as hysteresis loop. It is obtained by magnetisation and demagnetisation of the magnetic material.

» B increases when H is increased. At point a , B becomes saturated. When H is decreased B does not follow the path oa, it follows path abcd. If we again increase the value of H; then B follows the path defa.

» In the curve bo and oe gives the measure of retentivity of the material.

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$\Large\bold\star\underline{\underline\textbf{Theory of Paramagnetism\:}}$

→ Paramagnetic material possesses some magnetic dipole moments due to the orbital and spin motion of electrons around their axis. Due to the thermal agitation the dipole moments are arranged randomly. Therefore the net dipole moment is zero. When external magnetic field is applied, the dipole moments align themselves in the direction of applied field. The dipole moments fail to attain significant alignment at ordinary temperature and field. Therefore, the paramagnetic material gets weakly magnetised.

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Hope it helped u.

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