Explain the hysteresis loop of a magnetic material with neat diagram.
Hysteresis loop of magnetic material:
The circuit arrangement for plotting the hysteresis loop is shown in figure given below. The electromagnetic part consists of a coil wound on the iron ring. The current direction can be reversed using reversible switch as shown. The magnitude of current is changed by varying the potential divider resistance. Magnetic ring is subjected to a cycle of magnetization and demagnetization for both the directions of the current. Then it is found that flux density B in the ring lags behind the applied magnetizing force H. The graph of flux density B versus magnetizing force H plotted for one magnetic reversal is called hysteresis loop. Meaning of hysteresis is to lag behind.