Practice question
Question
Which of the following correctly relates the coefficients of linear and area expansion?
Explanation
The coefficient of area expansion is approximately twice the coefficient of linear expansion (ΔA/A≈2αlΔT), as area involves two dimensions. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Area coefficient is twice the linear coefficient. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
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