Question

There are four iron rods R1, R2,R3 and R4 of the same dimensions. The temperature of R1 is raised to 500°C that of R2 to 250°C that of R3 to 1000°C and that of R4 to 800°C. Which rod will have the maximum linear expansion?
(I) R1
(II) R2
(III) R3
(IV) R4​

Answer 1

Explanation:

Correct option is

D

2

3

If α be coefficient of linear expansion of iron, coefficient of linear expansion of copper =

2

α

.

Thermal force on copper is F

c

=AY(α/2)θ

and thermal force on iron is F

i

=AYαθ

F

i

F

c

=

2

3

Answer 2

Answer:

I don't no sorry for this i don't really