Explain electric field intensity. How can the fields of a point charge and a parallel-plate capacitor be represented using field lines?

Solution & explanation

E = F/q₀ for a small positive test charge. A positive point charge has radially outward lines; negative has inward lines. Between large parallel oppositely charged plates, central lines are parallel, equally spaced and directed positive to negative, indicating an approximately uniform field; edge fringing is omitted.