Question

On heating area of a plate increase
by 0.08%. If the rise in its
temperature in this case is 80°C,
coefficient of cubical expansion of
that material is
(A) 15 x 10-6/°C
(B) 15 x 10-4/°C
(C) 15 x 10-5/°C
(D) 15 x 10 3/°C​

Answer 1

Answer:

The percentage increase in area of a square plate of that metal when it is heated through 100∘C is now

Answer 2

Answer:

Increase in area = initial area x coefficient of area expansion x change in temperature

Here all the values are given except coefficient of area expansion

Coefficient of areal expansion=increase in area/(initial area × change in temperature)

Coefficient of areal expansion =

1.2×100

2.4×10

−4

Putting the given values, we get coefficient of area expansion = 2 x 10

−6

Now coefficient of volume expansion =

2

3

x coefficient of area expansion =3× 10

−6