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$>$ Which of the three materials is more conductive $?$

$>$ Why $Q$ while using silicone is less than copper $?$

$>$ What is the $Q$ value for material $($c$)$

$>$ What will be the achieved value of $T_2$ if the $2x$ the heat amount is transferred?

For material $($c$),$ How would the Q value will be affected if thickness got doubled while using the same material