(2) 5. Describe the motion of a negatively charged particle when the direction of its initial velocity is perpendicular to the direction of the electric field. E swer: In an electric field made by two plates with different charges. The direction of the field is from positive to negative. Since the particle is negatively charged, when it enters the field perpendicular to it, it will curve toward the positively charged plates. Using the diagram as a guide, it will move to the left as long as it keeps its initial vertical speed. (2) 6. Refer to Newton's first and second laws to explain the motion you described in question five