A conductor has a resistivity of 2.20 x 10-8 m at 20C and a temperature coefficient of resistivity of 3.70 x 10-3 (C)-1. Suppose this material is used to construct a cylindrical wire with a diameter of 90.0 mm and a length of 0.25 m. a) What is the wire's resistance at 20C? _______________________

b) How much power is dissipated in the wire at 20C if a voltage of 12.0 V is placed across it? _______________________

c) Suppose the wire is heated up to 45C; what is its new resistance? _______________________

d) At this new temperature, what is the current in the wire if a voltage of 12V is placed across it?