.9 ILW In Fig. 28-32, an electron accelerated from rest through po- tential difference V, = 1.00 kV enters the gap between two paral- lel plates having separation d = 20.0 mm and potential difference d Figure 28-32 Problem 9. The question continue. V2 = 100 V. The lower plate is at the lower potential. Neglect fring- ing and assume that the electron's velocity vector is perpendicular to the electric field vector between the plates. In unit-vector nota- tion, what uniform magnetic field allows the electron to travel in a straight line in the gap? 4) For problem .9, solve for the magnetic field (in mT) when the accelerating voltage remains 1000 V and the voltage difference between the deflection plates (the "horizontal" par with one above the other in the