BH Curve Apparatus (Solenoid Type)

Solenoid Structure: The apparatus features a long solenoid coil designed to create a uniform magnetic field when current is passed through it.

Sample Placement: A ferromagnetic specimen (such as an iron rod) is placed inside the solenoid for testing its magnetic properties.

Measurement: The system typically includes a reversible key, ammeter for current measurement, and a magnetometer or CRO (Cathode Ray Oscilloscope) to detect and measure the magnetic flux density (

B

B) and magnetic field strength (

H

H).

Operation: Current through the solenoid can be varied, reversing as needed, and the induced magnetic field in the specimen is measured. The procedure involves increasing and decreasing the current systematically to obtain a plot of

B

B vs

H

H, demonstrating the magnetic hysteresis loop.

Graphical Plotting: The resulting data on

B

B (magnetic flux density) versus

H

H (magnetic field strength) is plotted, showing important magnetic properties like retentivity and coercivity.

This apparatus is pivotal in studying the hysteresis behavior and magnetic memory of ferromagnetic materials, often used in physics and electrical engineering laboratories for practical demonstration of core concepts.