A metal rod of length 100cm is heated through 100oC, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10-6K-1]

A. 4mm
B. 3mm
C. 2mm
D. 1mm

Correct Answer: Option B

B. 3mm

Explanation

I2−I1=I1,θα−1×100×3×10−5

= 3 x 10-3m

= 3mm