An electron is projected with an initial speed vo = 1.70x106 m/s into the uniform field between the parallel plates in the figure (Figure 1). Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The electron enters the field at a point midway between the plates. Part A If the electron just misses the upper plate as it emerges from the field, find the magnitude of the electric field, You may want to review (Page) Express your answer in newtons per coulomb. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Electron in a uniform field. | να ΑΣφ Figure K 1 of 1> E = N/C Submit Request Answer K 2.00 cm Part B Suppose that in the figure the electron is replaced by a proton with the same initial speed vo. Would the proton hit one of the plates? 1.00 cm E yes no Previous Answer

Part A and B

Electric Fields 1. A wire has been given a net positive electric charge Q evenly distributed along its length. The wire has a length of L and is located on the x-axis with its left end at the origin as drawn. Set up the integral you need to do to find the electric field at a distance d to the left of the origin. Some steps you may wish to follow are: a. Figure out the direction the electric field will have at our location x = -d. This will be the same as f b. Write the differential charge dą in terms of the charge per length and a differential length. c. ris a function of x which means we have to integrate to find the electric field. Write down r. d. Put everything together (including the vector direction) into one integral that would allow you to find the E-field. Write this in the box below. e. You are not required to complete the integral and no credit is given for completing the integral. d dE =

need help on part A, C, D

The electric field 0.340 m from a very long uniform line of charge is 760 N/C. Part A How much charge is contained in a section of the line of length 2.80 cm ? lgl = C Submit Request Answer Provide Feedback

Problem 1 Shown on the right is an electroscope. The sphere on the top, the leaves at the bot- tom, and the rod connecting them are made by conducting material. The spherical shell that blocks the influence of external electric fields is also made by conducting material but the contact with the rod is insulated, so that charges will not shuffle between the rod and the spherical shell. The electroscope is first negatively charged by touching the sphere with a negatively charged plastic plate. The leaves spread apart and we remove the plastic plate. We then bring a positively charged glass bar close to the sphere without touching the sphere. What happens to the leaves? Leaves (A) One leaf moves higher, the other lower. (B) Nothing changes to the leaves (C) The leaves spread farther apart. (D) The leaves get closer together. Clearly specify/circle your answer, and give a brief explanation.