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The coefficient of thermal conductivity ...

The coefficient of thermal conductivity of copper, mercury and glass are respectively `K_(c), K_(m)` and `K_(g)` that `K_(c) gt K_(m) gt K_(g)`. If the same quantity of heat is to flow per second per unit of each and corresponding temperature gradients are `X_(c), X_(m)` and `X_(g)`, then

A

`X_(c)=X_(m)=X_(g)`

B

`X_(c)gtX_(m)gtX_(g)`

C

`X_(c)ltX_(m)ltX_(g)`

D

`X_(m)ltX_(c)ltX_(g)`

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