Concept #1: Intro to Capacitors

Practice: An electron moves into a capacitor at an initial speed of 150 m/s. If the electron enters exactly halfway between the plates, how far will the electron move horizontally before it strikes one of the plates? Which plate will it strike?

Consider the three infinite sheets of charge shown in the figure. The first sheet has chage density σ1 = +10μC/m2 and lies on the yz-plane. The second sheet has charge density of σ2 = +10μC/m2 and is parallel to the yz-plane at x = 0.10 m. The third sheet has charge density of σ3 = +10μC/m2 and is parallel to the yz-plane at x = 0.20 m. Determine the electric field at the point P (0.05 m, 0).

The two infinite, conducting plates of thickness = h and separation = d are oppositely charged. The charge per unit area on the top plate is σ , and the charge on the bottom plate is σ , where σ is a positive number. What is the magnitude of the electric field in each region depicted in the picture?

Four parallel infinite sheets of charge spaced by 4 cm between adjacent sheets are shown edgewise in the figure. Their charge densities are as indicated with σ = 2.0 μC/m2. What is the magnitude of the electric field at point P midway between two sheets as shown?
(1) 4.5 × 105 N/C
(2) 2.3 × 105 N/C
(3) 1.13 × 105 N/C
(4) 9.0 × 105 N/C
(5) 0