6. [-/2 Points] DETAILS (a) What magnitude point charge creates a 90,000 N/C electric field at a distance of 0.255 m? C (b) How large is the field at 20.0 m? N/C7. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHE A man is standing beneath two rain clouds, equidistant from each cloud, as shown in the figure. Cloud A has an excess of 2.3 x 10# negative charges while cloud B has 2.3 x 10" positive charges (where a charge has magnitude e). 0.5 km 2 km (a) What is the magnitude of the net electric field where the man is standing? N/C [b) What is the direction of the net electric field where the man is standing? (Assume the +x-axis is to the right.) counterclockwise from the +x-axis8. [-/1 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A proton enters a parallel-plate capacitor traveling to the right at a speed of 1.280 x 105 m/s, as shown in the figure. The distance between the two plates is 1.62 cm. The proton enters the capacitor halfway between the top plate and the bottom plate; that is, a distance r = 0.810 cm from each plate, as shown in the figure. The capacitor has a 2.75 x 10"# N/C uniform electric field between the plates that points downward from the top plate to the bottom plate. Neglecting gravitational forces, what horizontal distance does the proton traverse before the proton hits the bottom plate? m9. [-/4 Points] DETAILS A proton moves in the electric field E = 2501 N/C. (Express your answers in vector form.) (a) What are the force on (in N) and the acceleration (in m/s ) of the proton? F = N a m/$2 (b) What are the force on (in N) and the acceleration (in m/s ) of an electron in this field? F = N a = m/$2