I need guidance calculating the capacitance between two infinitely parallel long wires that are parallel to a large flat metal sheet. Condition: V = 0 at the origin. Both plane and lines have uniform charge. Left line: Negative charge density Right Line: Positive charge density Radius of lines:a Distance between lines: L Distane between lines and plane: D My attempt. Find Electric field (El) due to both lines at point P Find Electric field (Ep) due do plane at point P E at point P = EP = Ep + El ΔV(x,y) = -∫EPdy + C Now solve for C: C = ΔV(0,0) +∫EPdy|(0,0) Finding capacitance: C = Q/ΔV ΔV = ... not sure what to do from here... Is my approach correct so far?