As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a tungsten rod has a resistance of 5.91 Q 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 tungsten is 1.20 x 10- ("C) and the temperature coefficient of resistivity is 5.00 x 10-3 (C)-1.An iron wire has a resistance of 2.00 Q at 36.0"C. Determine its resistance (in Q) at 436-C. The temperature coefficient of resistivity for iron wire is 5.00 x 10 3 ("C) 1. (Assume that the temperature coefficient of resistivity was measured using the reference temperature 20"C.)