Which of the following cylindrical rods will coduct most heat when their ends are maintained at the same steady temperatures?

  • A

    Length $1\  m$, radius $1\  cm$

  • B

    Length $1\  m$, radius $2\  cm$

  • C

    Length $2\  m$, radius $1\  cm$

  • D

    Length $2\  m$, radius $2\  cm$

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