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Two rods A and B of different materials ...

Two rods A and B of different materials but same cross section are joined as in figure. The free end of A is maintained at 100°C and the free end of B is maintained at 0°C. If `l_2=2l_1,K_1=2K_2` and rods are thermally insulated from sides to prevent heat loses then the temperature `theta` of the junction of the two rods is

A

`80^@ C`

B

`60^@ C`

C

`40^@ C`

D

`20^@ C`

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The correct Answer is:
A
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