The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar) Correct Answer $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{\text{R}}_1^4 - {\text{R}}_2^4} \right)$$

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