A 5.07 m length of 2.1 mm diameter wire carries 703 mA current when 22.3 mV is applied to its ends. Determine the resistivity of the wire.
Resistance of a wire in Ω R = ρL/A ρ is resistivity of the material in Ω-m L is length in meters A is cross-sectional area in m² A = πr², r is radius of wire in m Use current and voltage to determine resistance. Plug that into the above and solve for ρ. Be sure to change numbers into meters.
Sep 26, 2017