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Problem 4 A proton moves initially with velocity v m/s directed in the hori- zontal direction exactly midway between two oppositely charged conducting plates held fixed at 0 Volts and V, and with separation d. A. Indicate which plate is positively and negatively charged and draw an approximate trajectory for the proton. B. Develop an expression for the magnitude of the velocity of Figure 2: A proton flies be- tween two plates held at differ- ent potentials. PHYSICS 2: PROBLEM SET 3 3 the proton just before it hits the plate. You can safely neglect any gravitational influences. C. Describe how the final velocity would be different if the sepa- ration between the plates was halved. (Assume that the proton still starts from half way between them).