A transformer consists of two separate coils (inductors) wound around an iron core as shown in Figure 2.62. There are many turns in both the primary and secondary coils but, for simplicity, only few are shown. It is known that the primary coil has a resistance of 5.48 2 at 20 degrees Celsius. After two hours of operation, it is found that the primary coil resistance has risen to 6.322 Compute the temperature rise of this coil. Primary FU Iron Core Coil Figure 2.62. Circuit for Problem 9 Secondary Coil