Physics - Elasticity Question with Solution | TestHub

PhysicsElasticityMiscellaneousMedium2 minQB

PhysicsMediumsingle choice

Figure shows how the potential energy $V$ for two neighbouring atoms varies with their separation $r$ . Which statement is correct?

Answer:

Solution:

Equilibrium is at the minimum of $V (r)$ , which is at $Y$ , not at $X$ . So (A) is false.

Force $F = - \frac{d V}{d r}$ . For $r < O Y$ the slope is negative, so $F > 0$ : repulsive. (C) is true.

For $r > O Y$ the slope is positive, so the force is attractive. (D) is false.

Hooke's law applies near the minimum (at $Y$ ), not at $Z$ . (B) is false.

Stream:JEESubject:PhysicsTopic:ElasticitySubtopic:Miscellaneous

⏱ 2mℹ️ Source: QB

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