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Two parallel infinite line charges with linear charge densities $+\lambda$ C/m and $-\lambda$ C/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges?

(1) Zero

(2) $2\lambda\over\pi\epsilon_0R$ N/C

(3) $\lambda\over\pi\epsilon_0R$ N/C

(4) $\lambda\over2\pi\epsilon_0R$ N/C
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Ans: (3) $\lambda\over\pi\epsilon_0R$N/C

Sol:

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