An infinite line charge produces a field of 9 x 104 N/C at a distance of 2cm. Calculate the linear charge density.
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E = 9 x 104 NC-1, r = 2 cm = 2 x 10-2m E = 9 x 109 x \(\frac { 2λ }{ 2 }\) λ = \(\frac{\mathrm{Er}}{9 \times 10^{9} \times 2}\) = \(\frac{9 \times 10^{4} \times 2 \times 10^{-2}}{9 \times 10^{9} \times 2}\) = 0.1µC/m
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