The resistance of No.28 copper wire is 0.00213Ω/cm. The resistivity of the dommercial copper is1.72E-8 Ωm. Find:
a. the diameter of No.28 copper wire
b. the heat power generated on a 12-m No.28 copper wire whenit is connected to a 1.5 V battery (Neglect the internal resistance of the battery.).