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Question
In a flat collar pivot bearing, the moment due to friction is proportional to
Options:
A .  (r₁² - r₂²)/(r₁ - r₂)
B .  (r₁² - r₂²)/(r₁ + r₂)
C .  (r₁³ - r₂³)/(r₁² - r₂²)
D .  (r₁³ - r₂³)/(r₁ - r₂)
Answer: Option C

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