A heat source at $T = 10^3\, K$ is connected to another heat reservoir at $T = 10^2\, K$ by a copper slab which is $1\, m$ thick. Given that the thermal conductivity of copper is $0.1\, WK^{-1}\, m^{-1}$, the energy flux through it in the steady state is ........... $Wm^{-2}$

  • [JEE MAIN 2019]
  • A

    $90$

  • B

    $120$

  • C

    $65$

  • D

    $200$

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  • [KVPY 2014]