JEE Main Physics question
Statement 1: A solid shaft is found to be stronger than a hollow shaft of the same material and mass.
Statement 2: The torque required to produce a given twist in a solid cylinder is smaller than that required to twist a hollow cylinder of the same size and material.
Answer: (D)
Solution
For shafts of the same mass (and length, material), the hollow shaft necessarily has a larger outer radius, which — because the polar moment of area depends on — gives it a larger torsional rigidity than the solid shaft. So a hollow shaft is actually stronger (not
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