Three rods made of the same material and having same cross-sectional area but different lengths $10\, cm, 20\, cm$ and $30\, cm$ are joined as shown. The temperature of the junction is......... $^oC$ 

  • A

    $10.8$

  • B

    $14.6$

  • C

    $16.4$

  • D

    $18.2$

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