2137\" -TWO 1.20111) [1011 Figure \"1.87 conducting rods meet at a right angle. One rod carries IQ _ E209 __ i! - - w +2.50 41C of charge dlStI'lb- uted uniformly along its length, and the other carries --2.50 {LC distributed uniformly along it (Fig. P2137). (a) Find the 1.20m magnitude and direction of the electric eld these rods produce at point P, which is 60.0 cm from each rod. (b) If an electron is released at P, what are the magnitude and direction of the net force that these rods exert on it? 21.29 -- CP An electron is pro- Figure 21.29 jected with an initial speed 00 = K2 00 cm _>1 1.60 X 106 m/s into the uniform - ' eld between two parallel plates 1 ml cm __ (Fig. E21.29). Assume that the eld I between the plates is uniform and directed vertically downward and that the eld outside the plates is zero. The electron enters the eld at a point midway between the plates. (a) If the electron just misses the upper plate as it emerges from the eld, find the magnitude of the electric eld. (b) Suppose that the electron in Fig. E2129 is replaced by a proton with the same initial speed vo. Would the proton hit one of the plates? If not, what would be the magnitude and direction of its vertical displacement as it exits the region between the plates? (c) Compare the paths traveled by the electron and the proton, and explain the differences. (d) Discuss whether it is reasonable to ignore the effects of gravity for each particle. 21.41 - Three negative point charges lie along a line as shown in Fig. E21.4l. Find the magnitude and direction of the electric field this combination of charges produces at point P, which lies 6.00 cm from the 2.00-p.C charge measured perpendicular to the line connecting the three charges. Figure E21 .41 To s-oouc I l