Two conducting rods $A$ and $B$ of same length and cross-sectional area are connected $(i)$ In series $(ii)$ In parallel as shown. In both combination a temperature difference of $100^o C$ is maintained. If thermal conductivity of $A$ is $3K$ and that of $B$ is $K$ then the ratio of heat current flowing in parallel combination to that flowing in series combination is

86-97

  • A

    $\frac{{16}}{3}$

  • B

    $\frac{3}{{16}}$

  • C

    $\frac{1}{1}$

  • D

    $\frac{1}{3}$

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