7. [-/4 Points] DETAILS SERCP11 16.1.OP.001. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Inside a particular radiation therapy device, there is a uniform electric field with a magnitude 385 N/C pointing in the positive x-direction. An electron, initially at rest, moves a distance of 3.40 cm in this field (a) How much work (in J) does the electric field do on the electron? (b) What is the change in potential energy (in J) of the entire system (radiation therapy device plus electron)? (c) What is the velocity (in m/s) of the electron after it moves the 3.40 cm distance? magnitude m/s direction -Select-- v Need Help? Read It 8. [-/5 Points] DETAILS SERCP11 16.1.OP.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The figure below shows a small, charged sphere, with a charge of q = +39.0 nC, that moves a distance of d = 0.175 m from point A to point B in the presence of a uniform electric field E of magnitude 255 N/C, pointing right. (a) What is the magnitude (in N) and direction of the electric force on the sphere? magnitude N direction -Select-- (b) What is the work (in J) done on the sphere by the electric force as it moves from A to B? J (c) What is the change of the electric potential energy (in J) as the sphere moves from A to B? (The system consists of the sphere and all its surroundings.) PER - PEA (d) What is the potential difference (in V) between A and B? VB - VA= Need Help? Read It