Answer:
55.62 °C increase in temperature
Step-by-step explanation:
Copper has a Temperature Coefficient of at near room temperature of +0.393 percent per degree C increase in temperature.
Hence to increase the resistance by 14 % =
14/0.393 = 35.62 °C increase in temperature
That is if the temperature increases 35.62 °C, the resistance will increase 0.393%×35.62 or 14 %.
Hence the new temperature will be 35.62 + 20 = 55.62 °C