The document discusses different materials used for cores in electrical applications and their properties. It lists several materials including 35% cobalt-iron, tungsten steel, mild steel, soft iron, stalloy, and permalloy. For each it provides their K factor value and describes their hysteresis loss and retentivity as being very high, high, or low.

1. Applied Electricity Two

2. Applied Electricity Two L= inductance measured in Henries μ= the absolute permeability of the core materials μ0= the permeability of free space and is equal to H/m (Henry/meters) μr= the relative permeability of the core materials

3. Applied Electricity Two

4. Applied Electricity Two

5. Applied Electricity Two Material K Factor Hysteresis Loss Retentivity 35% Cobalt-iron 100 Very High Very High

6. Applied Electricity Two Material K Factor Hysteresis Loss Retentivity 35% Cobalt-iron 100 Very High Very High Tungsten Steel 200 Very High Very High

7. Applied Electricity Two Material K Factor Hysteresis Loss Retentivity 35% Cobalt-iron 100 Very High Very High Tungsten Steel 200 Very High Very High Mild Steel 1000 High Low

8. Applied Electricity Two Material K Factor Hysteresis Loss Retentivity 35% Cobalt-iron 100 Very High Very High Tungsten Steel 200 Very High Very High Mild Steel 1000 High Low Soft Iron 10 000 High Low

9. Applied Electricity Two Material K Factor Hysteresis Loss Retentivity 35% Cobalt-iron 100 Very High Very High Tungsten Steel 200 Very High Very High Mild Steel 1000 High Low Soft Iron 10 000 High Low Stalloy 150 000 Low Low

10. Applied Electricity Two Material K Factor Hysteresis Loss Retentivity 35% Cobalt-iron 100 Very High Very High Tungsten Steel 200 Very High Very High Mild Steel 1000 High Low Soft Iron 10 000 High Low Stalloy 150 000 Low Low Permalloy 100 000 Low Low