As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a iron rod has a resistance of 5.06 0 at 20.0*C, determine the resistance of the rod (in Q) at 120"C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for iron is 4.50 x 107 (*C)" and the temperature coefficient of resistivity is 4.50 x 10"(C)-1. 2.24 X