Question

sec
. A metal plate of area 1.2 m² increases its area
by 2.4 x 104 m’when it is heated from 0°C to
100° C. The coefficient of cubical expansion
of the metal expressed in per 'C is
1)2 x 10 214 x 106 3)6 x 10-6 4) 3 x 10-6
The length of
motold 00​

Answer 1

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