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Two uniform rods AB and BC have Young's ...

Two uniform rods AB and BC have Young's moduli `1.2 xx 10^(11) N//m^(2)` and `1.5 xx 10^(11) N//m^(2)` respectively. If coefficient of linear expansion of AB is `1.5 xx 10^(-5)//”^(@)C` and both have equal area of cross section, then coefficient of linear expansion of BC, for which there is no shift of the junction at all temperatures, is

A

`1.5xx10^(-5)//"^(@)C`

B

`1.2xx10^(-5)//"^(@)C`

C

`0.6xx10^(-5)//"^(@)C`

D

`0.75xx10^(-5)//"^(@)C`

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