A metal sheet of area 100cm² was heated through 70°C. Calculate its new area if the linear expansivity of the metal is 0.000017k‾¹

A. 100.06 cm²
B. 100.12cm²
C. 100.24cm²
D. 100.36cm²

Correct Answer: Option C

C. 100.24cm²

Explanation

A2 = A1(1 + 2 x θ)

= 100(1 + 2 x 1.7 x 10-5 + 70)

= 100.238