In a hardness test, L is load in kg, D is diameter of ball in mm and d is diameter of indentation in mm. Brinell Harness Number is expressed by the equation
- A. $BHN = \frac{L}{\pi D (D - \sqrt{D² - d²})}$
- B. $BHN = \frac{2L}{\pi D (D - \sqrt{D² - d²})}$
- C. $BHN = \frac{L}{\pi d (D - \sqrt{D² - d²})}$
- D. $BHN = \frac{2L}{\pi d (D - \sqrt{D² - d²})}$
Answer: B. $BHN = \frac{2L}{\pi D (D - \sqrt{D² - d²})}$
Explanation: Standard formula for BHN.