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

Question

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

Options:

A . A

B . B

C . C

D . D

Answer: Option B
Answer: (b).B

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