The resistance in a wire (circular cross section) is given by the formula: R = Q x L %3D A Where R is the resistance in ohms (S2)(0 )and e gis the resistivity of the material (constant for a material) in S2 Qm. Find the resistance and it's uncertainty in a copper wire of length 50 cm and radius 10 cm. The resistivity of copper is 2 x 10-0 N m 2 x 10 - 6 Qm and the uncertainty of L and r measurement is WL = = 0.5 cm &r=0.1 cm.