2-173 The thermal conductivity of a solid depends upon the
solid's temperature as k=aT+b where a and b are constants.
The temperature in a planar layer of this solid as it conducts
heat is given by
(a) aT+b=x+C_(2)
(b) aT+b=C_(1)x^(2)+C_(2)
(c) aT^(2)+bT=C_(1)x+C_(2)
(d) aT^(2)+bT=C_(1)x^(2)+C_(2)
(e) None of them