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7. | A copper wire of length 3m and 1mm diameter is subjected to a tension of 5N. Calculate the elongation produced, if the young’s modulus of copper is 120GPa. | |
A. | 15m | |
B. | 1800m | |
C. | 0.125 ×10-3 m | |
D. | 15.9mm | |
Answer: Option D | |
Explanation: | |
Young’s modulus = (Force ×Length)/(Area ×Elongation); Area=πr2 |
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