Length of arc,
L = (2Φ/360) x 2 pi R
L = (2Φ/2 pi) x 2 pi R = 2 Φ R
dQ = λ dx
dQ = (Q/2 Φ R) R dθ
dE = k (dQ/R2) cosθ
E = (kQ sinΦ)/(ΦR2)
Direction : positive x direction
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