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Three rods made of the same material and...

Three rods made of the same material and having same cross-section area but different length 10 cm, 20 cm and 30 cm are joined as shown. The temperature of the junction is

A

`19.2 "^(@)C`

B

`16.4 "^(@)C`

C

`11.5 "^(@)C`

D

`22"^(@)C`

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