03. A line with a uniform charge density of n (C/m) is lying between the points P_{1}\left(\begin{array}{c} -1 \\ -1 \\ 0 \end{array}\right) \text { and } P_{2}\left(\begin{array}{c} 1 \\

-1 \\ 0 \end{array}\right) Another line with the same uniform charge density of n (\mathrm{C} / \mathrm{m}) \text { is lying between the points } P_{1}\left(\begin{array}{c} -1 \\ 1 \\ 0 \end{array}\right) \text { and } P_{2}\left(\begin{array}{l} 1 \\ 1 \\ 0 \end{array}\right) . \text { What is the electric field } \text { at point } B\left(\begin{array}{l} 0 \\ 0 \\ 1 \end{array}\right) ?