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Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ? | |
A. | μ > tan α [Wrong Answer] |
B. | μ ≥ tan α [Correct Answer] |
C. | μ > tan 2α [Wrong Answer] |
D. | μ ≤ tan α [Wrong Answer] |