# write short notes on BH curve.

write short notes on BH curve.

BH curve is the graph plotted between B (i.e. flux density) and H (i.e. magnetic field strength). H is taken on x-axis and B is taken on y-axis. Different magnetic materials have different BH curve. And non magnetic material have a straight line instead of curve.

Suppose there is a coil wound on a core, core may be iron core or steel core or any other. And we apply emf to coil. By changing variable resistance we can vary current. If we decrease the resistance current will increase and if we increass the resistance current through the coil will decrease.

Also remember if the core shape is straight it is called solenoid and if the core shape is circular it is called toroid.

When we give the emf to coil and variable resistance is at maximum position means current flowing the coil is minimum and as soon as the current is increase coil get magnetize.

Initially the B and H increases slowly but after instep B increases rapidly. And after knee point the B start getting saturated. And at Bmax there is a straight line called saturation. After Bmax the B will not increase further.

BH curve is also called as magnetization curve.
This is  a very nice and comprehensive answer.
@ibekwe Thanks....

B-H curve of magnetic material:

The B-H curve is the graphical representation of relation between flux density (B) and applied field strength (H), with H plotted on the x-axis and B plotted on the y-axis. Typical B-H curve is as shown in figure below:

The B-H curve can be described by dividing it into 3 regions. Region OA: For zero current, H = 0 and B is also zero. The flux density B then increases gradually as the value of H is increased. However B changes slowly in this region. Region AB: In this region, for small change in H, there is large change in B. The B-H curve is almost linear in this region. Region beyond B: After point B, the change in B is small even for a large change in H. Finally, the B-H curve will tend to be parallel to X axis. This region is called as saturation region.

The B-H curve is the relation between Flux density B in Wb/m2 (on Y Axis) and H in AT/m (on X axis) It is also known as magnetization characteristics. This curve particularly useful to know the characteristics of magnetic material which is generally used to construct pole of an electric machine. It also gives the behavior of the material to get magnetized with rise of current (AT) Initially the material doesn’t have any flux, hence the curve starts at point o. As the process of magnetization starts & current increases, the flux density in the material also increases in proportion with the rise in current. The rise in flux density with rise in current will continue up to point ‘A’ till maximum flux density occurs. At point ‘A’ material gets magnetically saturated and the curve becomes flat (parallel to X axis)

← Prev Question Next Question →

## Related questions

104 views 1 answer
208 views 1 answer
411 views 0 answers
83 views 1 answer
108 views 2 answers
55 views 1 answer
89 views 2 answers
59 views 1 answer
93 views 2 answers
235 views 1 answer
271 views 1 answer
337 views 1 answer
167 views 1 answer
Last answer: In a load curve the highest point represents peak demand.
78 views 1 answer
98 views 1 answer
Last answer: The area under a load curve gives energy consumed.
66 views 1 answer
54 views 1 answer
141 views 3 answers
107 views 0 answers
283 views 1 answer
96 views 1 answer
5 views 1 answer
3 views 1 answer
2 views 1 answer
3 views 1 answer
68 views 0 answers
435 views 1 answer
80 views 1 answer
76 views 1 answer
69 views 0 answers
609 views 1 answer
114 views 1 answer
168 views 1 answer
76 views 0 answers
118 views 1 answer
91 views 1 answer
107 views 1 answer
2 views 1 answer
2 views 1 answer
4 views 1 answer
9 views 1 answer
22 views 1 answer
8 views 1 answer
23 views 1 answer
13 views 1 answer