4) Consider two oppositely charged parallel metal plates. One at the top and one at the bottom. The distance between them is 12 m. the electric potential (or simply the potential)

at the bottom plate (very near the plate) is Vbottom = 104V (the negatively charged plate), and the electric potential at the top plate (very near the plate) is Vtop = 2.5 × 10¹V (the positively charged plate). A uniform (constant) electric field is present between the plates. [5 marks] a. Find the electric field between the plates b. Using the conservation of energy, consider a positively charged particle with charge of q = 4.5 × 10-18C goes from the top plate to the bottom, starting from rest. Calculate the mass of the particle if it reaches the plate at speed of v = 3 x 107 m. S