Two parallel infinite line charges with linear charge densities \( +\lambda \mathrm{C} / \mathrm...

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Two parallel infinite line charges with linear charge densities \( +\lambda \mathrm{C} / \mathrm{m} \) and \( -\lambda \mathrm{C} / \mathrm{m} \) are placed at a distance of \( 2 \mathrm{R} \) in free space. What is the electric field mid-way between the two line charges?
a. Zero
b. \( \frac{2 \lambda}{\pi \varepsilon_{0} \mathrm{R}} \mathrm{N} / \mathrm{C} \)
c. \( \frac{\lambda}{\pi \varepsilon_{0} \mathrm{R}} \mathrm{N} / \mathrm{C} \)
d. \( \frac{\lambda}{2 \pi \varepsilon_{0} R} \mathrm{~N} / \mathrm{C} \)
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