MCQOPTIONS
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MCQOPTIONS
| 1. |
A 5 m long aluminium wire (\[Y=7\times {{10}^{10}}N/{{m}^{2}})\] of diameter 3 mm supports a 40 kg mass. In order to have the same elongation in a copper wire \[(Y=12\times {{10}^{10}}N/{{m}^{2}})\] of the same length under the same weight, the diameter should now be, in mm. [AMU 2000] |
| A. | 1.75 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 5.0 |
| Answer» D. 5.0 | |