A thin wire of length L has a uniform charge density ĢĪ». The wire is bent into a semicircle with its center at the origin. The magnitude of the electric field at the center of the semicircle is 2 x 10+4 (in N/C). If Ī» = 6.1 x 10-8 C/m, what is the value of L (in cm)? K = 9 x 10+9 N.m2.C-2, ε0 = 8.85 x 10-12 C2.N-1.m-2