A 4.0 m long wire is subjected to stretching force and its length increases by 40 cm. The percent elongation which the wire undergoes is:
Correct answer: C. 10 %
- A. 0.10 %
- B. 40 %
- C. 10 %
- D. 20 %
Explanation
Given:Original length = 4mChange in length = 40 cm = 0.4 mPercentage elongation = ?Formula:To calculate the percentage elongation, we need to divide the change in length of the wire by its original length and then multiply by 100 to express it as a percentage. So,Percentage elongation = (Change in length / original length) × 100Percentage elongation = (0.4 / 4) × 100 = 0.1 × 100 = 10%
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