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0.5m thick plane wall has its two surfaces kept a 3000C and 2000C. Thermal conductivity of the wall varies linearly with temperature and its values at 3000C and 2000C are 25 W/mK and 15 W/mK, respectively. Then the steady heat flux through the wall is                      (IES-02)

(a) 8 kW/m2                (b) 6.33 W/m2K

(c) 20 W/m2K             (d) 30 W/m2K

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