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| Q. |
The deflection of a helical spring is |
| A. | Directly proportional to d3 |
| B. | Directly proportional to d3/2 |
| C. | Directly proportional to d |
| D. | Directly proportional to d4 |
| E. | Directly proportional to d2 |
| Answer» D. Directly proportional to d4 | |
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