1. The problem statement, all variables and given/known data An electron starts from one plate of a charged closely spaced (vertical) parallel plate arrangement with a velocity of 1.63x104 m/s to the right. Its speed on reaching the other plate, 2.10 cm away, is 4.15x104 m/s. ... If the plates are square with an edge length of 25.4 cm, determine the charge on each. Given and Known: vi = 1.63x104 vf = 4.15x104 d = 2.10 cm A = (25.4 cm)2 = (0.0645 m2) me = 9.109x10-31 kg qe = 1.602x10-19 C k = 9.00 x 109 Nm2/C2 2. Relevant equations a = (vf-vi) / (tf-ti) F = ma E = Fq / q Q = EA / 4[pi]k 3. The attempt at a solution First, I used: F = ma, and E = Fq / q And got: E = ma / q E = (2.52x104-N/C) (9.109x10-31 kg) / (1.602x10-19 C) E = 6.823 x 10-6 N/C Then, Q = EA/4[Pi]k Q = (6.823 x 10-6 N/C) (0.0645 m2) / 4[Pi](9.00x109 Nm2/C2 Q = 3.89 x 104 C So, this does not agree with the answer key's 1.13x10-13 C, but it seems like I'm making sensible steps toward the answer. Guidance, please?