1. The problem statement, all variables and given/known data A uniform line charge of linear charge density 5 nC/m extends from x = 0 m to x = 4 m. Find the electric field at x = 7 m. Answer in units of N/C. 2. Relevant equations 8.85 × 10^−12 C2/(N · m^2) is the permittivity constant 8.98755 ×10^9 (N · m^2)/C^2 is Coulomb's constant Gauss's Law surface integral of E da = Q/(permittivity constant) 3. The attempt at a solution I know the field of of a point on the SIDE of the same line segment is kQ (r square root of (r^2 +(L/2)^2)) Where r is the distance from the rod, and L the length of the rod, but my attempts are wrong. I do not know how to find the field of a rod on the same axis.