A wire is stretched by a force that causes an extension. The energy is stored in it only when:
Correct answer: A. The extension of wire is proportional to force applied
- A. The extension of wire is proportional to force applied
- B. The cross-section area of the wire remains constant
- C. The wire is not stretched beyond its elastic limit
- D. The weight of wire is negligible
Explanation
The energy stored in the wire is potential energy, when the wire is extended proportionally to the force applied PE=½ kx2. (c) is not a valid answer because the wire would still hold potential energy even when its stretched beyond its elastic limit.
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