The thermal conductivity of a material in $CGS$ system is $0.4$ . In steady state, the rate of flow of heat $10 cal/sec-cm2$ , then the thermal gradient will be ....... $^oC/cm$

  • A

    $10$

  • B

    $12$

  • C

    $25$

  • D

    $20$

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  • [JEE MAIN 2022]

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