Consider a medium in which the heat conduction equation is given in its simplest form as 
(a) Is heat transfer steady or transient?
(b) Is heat transfer one-, two-, or three-dimensional?
(c) Is there heat generation in the medium?
(d) Is the thermal conductivity of the medium constant or variable?
For a medium in which the heat conduction equation is given by 
(a) Heat transfer is transient
(b) it is two-dimensional
(c) there is no heat generation
(d) the thermal conductivity is constant
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