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A thin wire of length L has a uniform charge density λ. 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 3 x 10+4 (in N/C). If L = 10.55 cm, what is the value of λ (in C/m)?
K = 9 x 10+9 N.m2.C-2 , ε0 = 8.85 x 10-12 C2.N-1.m-2
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