Hysteresis loop || unique explanation with the help of magnetic dipoles

#Basics #Hysteresisloop #EKguru
in this video i'm going to explain what is hesteresis loop and how it is formed with the help of magnetic dipoles
Step 1:
When supply current I = 0, so no existence of flux density (B) and magnetizing force (H). The corresponding point is ‘O’ in the graph above.
Step 2:
When current is increased from zero value to a certain value, magnetizing force (H) and flux density (B) both are set up and increased following the path o – a.
Step 3:
For a certain value of current, flux density (B) becomes maximum (Bmax). The point indicates the magnetic saturation or maximum flux density of this core material. All element of core material get aligned perfectly. Hence Hmax is marked on H axis. So no change of value of B with further increment of H occurs beyond point ‘a’.
Step 4:
When the value of current is decreased from its value of magnetic flux saturation, H is decreased along with decrement of B not following the previous path rather following the curve a – b.
Step 5:
The point ‘b’ indicates H = 0 for I = 0 with a certain value of B. This lagging of B behind H is called hysteresis. The point ‘b’ explains that after removing of magnetizing force (H), magnetism property with little value remains in this magnetic material and it is known as residual magnetism (Br). Here o – b is the value of residual flux density due to retentivity of the material.
Step 6:
If the direction of the current I is reversed, the direction of H also gets reversed. The increment of H in reverse direction following path b – c decreases the value of residual magnetism (Br) that gets zero at point ‘c’ with certain negative value of H. This negative value of H is called coercive force (Hc)
Step 7:
H is increased more in negative direction further; B gets reverses following path c – d. At point‘d’, again magnetic saturation takes place but in opposite direction with respect to previous case. At point‘d’, B and H get maximum values in reverse direction, i.e. (-Bm and -Hm).
Step 8:
If we decrease the value of H in this direction, again B decreases following the path de. At point ‘e’, H gets zero valued but B is with finite value. The point ‘e’ stands for residual magnetism (-Br) of the magnetic core material in opposite direction with respect to previous case.
Step 9:
If the direction of H again reversed by reversing the current I, then residual magnetism or residual flux density (-Br) again decreases and gets zero at point ‘f’ following the path e – f. Again further increment of H, the value of B increases from zero to its maximum value or saturation level at point a following path f – a.
The path a – b – c – d – e – f – a forms hysteresis loop.