a) Find the resistance of a 1.3m length of gold wire with diameter 4.2×10^-5m . Express your answer to two significant figures and include the appropriate units.
b) Find the resistance of a 1.3m length of gold wire with diameter 4.7×10^-4m . Express your answer to two significant figures and include the appropriate units.
c) Find the resistance of a 1.3m length of gold wire with diameter 6×10^-3m . Express your answer to one significant figure and include the appropriate units.