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18) The electric field strength between two parallel conducting plates separated by 0.05 m is 8.75x104x104 V/m. a) What is the potential difference, in volts, between the parallel conducting plates? b) The electric potential of the lower-potential plate is defined as zero volts. What is the value of the electric potential, in volts, at a point in the gap between the plates that is 0.025 m from the zero- volt plate? 19) Charge q1 = 7 nC is located at the coordinate system origin, while (a,b) charge q2 = 2 nC is located at (a, 0), where a = 0.75 m. The point P has 91 coordinates (a, b), where b = 0.75 m. A third charge 93 = 17 nc will be placed later. (n=10-9) a) Find the electric potential Vp at point P, in volts. Assume the potential is zero at infinity. b) How much work W, in joules, would you have to do to bring the third charge, q3, from very far away to the point P