Discussion
Assertion (A): Angle of twist is proportional to the cube of the member's length.
Reason (R): Angle of twist depends on the torque, the length and the torsional rigidity.
Select the correct answer from the options below.
Answer: C
The assertion is false while the reason, though loosely stated, is true. Twist is linear in length, not cubic; it is bending deflection that carries the cube. Doubling a shaft's length doubles its twist under the same torque.
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