Given below are two statements: one is labell | vedclass

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(A) Assertion $A$ is true: When a rod is heated freely,it expands without any external constraint. Since there is no constraint to prevent expansion,n

Vedclass · Accepted Answer

Both $A$ and $R$ are true but $R$ is $NOT$ the correct explanation of $A$.

Vedclass · Answer

(A) Assertion $A$ is true: When a rod is heated freely,it expands without any external constraint. Since there is no constraint to prevent expansion,no internal restoring force or thermal stress is generated.Reason $R$ is true: Thermal expansion causes the length of the rod to increase upon heating,which is a physical fact.However,Reason $R$ does not explain why no thermal stress is developed. The absence of thermal stress is due to the lack of external constraints (freedom to expand),not simply because the length increases. Therefore,both $A$ and $R$ are true,but $R$ is not the correct explanation of $A$.

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