Question 3: Two charges Q1 = +12nC and Q2 = -6nC are placed on the x-axis at a distance 2d = 2 cm (see figure below - if you write your solutions on paper, just reproduce the figure). a) Calculate the electric field in point P. Start with a sketch, solve the problem algebraically, and plug in the numbers at the very end. b) Calculate the force experience by a charge q3 = -6nC placed at point P (magnitude and direction). c) Is there a field in point P when there is no charge placed there? Explain your