An iron wire with a diameter of 2 mm will be used to connect a voltage source to a 100 kΩ resistor. Numbers for conductivity and resistivity can be found in the textbook. (a) What is the current needed to flow through the resistor if the resistor is to produce 1 mW of heat? (b) What is the voltage drop across the 100 kΩ resistor if it has the current you found in (a)? (c) How long would your iron wire have to be to produce a 0.01 V drop along the length of the wire, assuming the current you found in (a)?

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