Question

a piece of steel has a length of 30 cm at 15 °C.At 90°C its length increases by 0.027cm . Its co-efficient of linear expansion is
a) 15×10^-6/°C
b) 12×10^-6/°C
c) 15×10^-6/°C
d) 20×10^-6/°C​

Answer 1

Explanation:

linear expansion ά=l2-l1/l1(deta T)

given l2-l1=change=0.027cm

l=30cm

delta T=90-15

=75

ά=0.027/30(75)

ά=0.000012

ά=12×10^-6

option b

Answer 2

Answer:

it answer is option C-)