Question

The basic magnetization curve for a ferromagnetic material is shown in figure. Then the value of relative permeability is highest for the point 

• A. P
• B. Q
• C. R
• D. S

Hint:

Relative permeability of a ferromagnetic material is maximum near the knee of the magnetization curve.

Answer 1

The Correct Option is B

Step 1: Relative permeability is defined as: muᵣ = (dB)/(dH) 

Step 2: It is equal to the slope of the B-H curve at a point. 

Step 3: From the given curve: 
• Slope is small near saturation (point S) 
• Slope is moderate at initial point P 
• Slope is maximum at the knee region (point Q) 

Step 4: Hence, relative permeability is highest at point Q.