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A rod of length 50 cm is made of metal A...

A rod of length 50 cm is made of metal A and elongates by 0.2 cm when it is heated from `0^@C` to `100^@C` . Another rod made of metal B is of length 60 cm and elongates by 0.18 cm when heated from `0^@C` to `100^@C` . A composite rod of length 80 cm is made by welding pieces of rods A and B, placed end to end. When metal C is heated from `0^@C` to `50^@C` , it gets elongated by 0.08 cm.
The length of the rod of metal B in the composite rod is

A

10 cm

B

20 cm

C

30 cm

D

40 cm

Text Solution

Verified by Experts

The correct Answer is:
D
`L._B = 40 cm`
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