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Assertion (A): A hollow shaft will transmit a greater torque than a solid shaft of the same weight and same material

Reason (R): The average shear stress in the hollow shaft is smaller than the average shear stress in the solid shaft   

(a) Both A and R are individually true and R is the correct explanation of A

(b) Both A and R are individually true but R is NOTthe correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

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