Hysteresis loss is a type of energy loss that occurs in magnetic materials when they are subjected to a varying magnetic field. It is caused by the phenomenon of hysteresis, which refers to the lagging of the magnetic field behind the applied magnetic field.


The BH curve, also known as the magnetization curve, is a graphical representation of the relationship between magnetic field strength (H) and magnetic flux density (B) in a magnetic material. It is obtained by plotting the values of H on the x-axis and B on the y-axis.


The H/B curve is the inverse of the BH curve, where the values of B are plotted on the x-axis and H on the y-axis. This curve is useful for determining the magnetic permeability of a material.


The B/H curve is the same as the BH curve, where the values of B are plotted on the x-axis and H on the y-axis. It represents the relationship between magnetic flux density (B) and magnetic field strength (H).


The B^2H curve is obtained by squaring the values of B on the BH curve and plotting them on the y-axis. It represents the relationship between the square of magnetic flux density (B^2) and magnetic field strength (H).


Hysteresis loss is determined from the B/H curve. It is calculated by integrating the area enclosed by the B/H curve. The area represents the energy dissipated as heat due to hysteresis.

The B/H curve provides information about the magnetic properties of a material, including its hysteresis characteristics. By analyzing the shape and size of the curve, we can determine the hysteresis loss associated with the material. The larger the area enclosed by the curve, the greater the hysteresis loss.

Therefore, option C, B/H curve, is the correct answer for determining hysteresis loss. The BH curve is not used directly for determining hysteresis loss, although it is related to the B/H curve. The B^2H curve represents the relationship between the square of magnetic flux density and magnetic field strength, but it is not used for determining hysteresis loss.