Constantan is an alloy (with 55% copper and 45% nickel) used in the construction of strain gauges. It has a resistivity of pc = 49 x 10-8 Q2 m. The length of the constantan wire is calculated using the formula. R=90 Q, L = RAC Pc Ac 7.85 x 10-7m = a- If the uncertainty in the measurement of R, A, and pc is 10% in each case, calculate the absolute error in the measurement of the length of the wire. b- If the total error is limited to half of the calculated value in part-a, how do you allocate the accuracy to individual measurements?