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[" 55.A rod of length "l" and cross-sect...

[" 55.A rod of length "l" and cross-sectional area A nas a "],[" variable conductivity given by "K=alpha" T,where "alpha" is "],[" a positit ve constant and T is temperature in kelvin."],[" Two ends of the rod are maintained at "],[" temperatures "T_(1)" and "T_(2)(T_(1)>T_(2))" .Heat current "],[" flowing through the rod will be "],[[" (a) "(A alpha(T_(1)^(2)+T_(2)^(2)))/(l)," (b) "(A alpha(T_(1)^(2)+T_(2)^(2)))/(l)],[" (c) "(A alpha(T_(1)^(2)+T_(2)^(2)))/(3l)," (d) "(A alpha(T_(1)^(2)-T_(2)^(2)))/(2l)]]

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