You have discovered a particle gun from an alien civilization. you have determined that the particles have charge -2e and a mass of 50u. (u = atomic mass unit.) to determine the speed of the particles in the ray, you study the trajectory through a region of uniform electric field. the uniform field is created by two very large uniformly charged sheets with charge densities of ; the positive sheet is horizontal and the negative sheet makes a 60 angle with the horizontal. you then shoot the particle ray through the region of space between the sheets, entering the region 4.0 mm horizontally to the side of the sheets’ intersection point and 1.0 mm vertically from the horizontal sheet, with an initial velocity parallel to the intersection axis. (a) find an expression for the net electric field at the entry point, ignoring edge effects. (i. e., you can treat the sheets as infinite.) your answer should be in terms of  and 0. (b) which sheet will the particle ray ultimately strike? explain how you know. (c) you find that the location where the ray hits the sheet is 5.0 cm from the entry edge of the sheet. if =25 nc/m2, what is the initial speed of the particles in the ray?