Effect of temperature on thermal conductivity.

Question

In a large plate, the steady temperature distribution is as shown in the figure below. If no heat is generated in the plate, the thermal conductivity ‘k’ will very as (T is temperature and a is a constant)

(IES-97)

(a)k₀(1+ aT)               (b) K₀(1-aT)

(c)K₀+ aT                  (d) K₀ -aT