12609. A circular shaft fixed at, A has diameter D for half of its length and diameter D/2 over the other half, as shown in the below figure. If the rotation of B relative to A is 0.1 radian, the rotation of C relative to B will be September 13, 2025 by Admin 0.4 radian 0.8 radian 1.6 radian 3.2 radian ✅ The correct answer is option C.