An aluminium plate of 100 cm length and 20 cm breadth at 273 K. The area is increased by $2 \mathrm{~cm}^2$ at $100^{\circ} \mathrm{C}$ the coefficient of linear expansion of plate is:

$6.6 \times 10^{-6} /{ }^\circ \mathrm{C}$

$10^{-2} /{ }^\circ \mathrm{C}$

$2 \times 10^{-6} /{ }^{\circ} \mathrm{C}$

JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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An aluminium plate of 100 cm length and 20 cm breadth at 273 K. The area is increased by

2 \mathrm{~cm}^2

100^{\circ} \mathrm{C}

the coefficient of linear expansion of plate is:

View answer and explanation

Correct option: A

5 \times 10^{-6} /{ }^\circ \mathrm{C}

Option A (

5 \times 10^{-6} /{ }^\circ \mathrm{C}

) is correct because it is calculated using the formula for area expansion and then relating it to linear expansion.