Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?

A. Nc = (1/2?). ?(R1 R2/g)

B. Nc = (1/4?). ?(g/R1 R2)

C. Nc = (1/?). ?(g/R1 R2)

D. Nc = (1/2?). ?(g/R1 R2)

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