The elastic energy density in a stretched wire is:
1. (stress)2 × strain
2. stress × strain
3. $$\frac12$$ × stress × strain
4. stress × (strain)2
Subtopic:  Potential energy of wire |
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When a metal wire elongates by hanging a load on it, the gravitational potential energy is decreased.

 1 this energy completely appears as the increased kinetic energy of the block 2 this energy completely appears as the increased elastic potential energy of the wire 3 this energy completely appears as heat 4 none of these
Subtopic:  Potential energy of wire |
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The amount of elastic potential energy per unit volume (in SI unit) of a steel wire of length $$100$$ cm to stretch it by $$1$$ mm is: (Given: Young's modulus of the wire = $$2.0\times 10^{11}$$ Nm-2)
 1 $$10^{11}$$ 2 $$10^{17}$$ 3 $$10^{7}$$ 4 $$10^{5}$$
Subtopic:  Potential energy of wire |
62%
From NCERT
NEET - 2023
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A wire of length $$L$$ and cross-sectional area $$A$$ is made of a material of Young's modulus $$Y.$$ It is stretched by an amount $$x.$$ The work done is:
1. $\frac{YxA}{2L}$

2. $\frac{Y{x}^{2}A}{L}$

3. $\frac{Y{x}^{2}A}{2L}$

4. $\frac{2Y{x}^{2}A}{L}$

Subtopic:  Potential energy of wire |
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A $$5$$ m long wire is fixed to the ceiling. A weight of $$10$$ kg is hung at the lower end and is $$1$$ m above the floor. The wire was elongated by $$1$$ mm. The energy stored in the wire due to stretching is:
1. zero
2. $$0.05$$ J
3. $$100$$ J
4. $$500$$ J

Subtopic:  Potential energy of wire |
78%
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