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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

0.4 radian
0.8 radian
1.6 radian
3.2 radian

Correct Answer: 1.6 radian

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