PROBLEM 1A: Consider the following charge arrangement. Charge qi is negatively charged; charges q2. 93, 94, and qs are positively charged. All 5 charges have magnitude 3.0 nC. The origin is marked by an X. All coordinates shown are in meters (e.g. q4 has coordinates x = -3m, y = -4m). (A) (10 pts) Draw and label all electric fields at the origin. (B) (14 pts) Calculate the magnitude and direction of the net electric field at the origin. (Note: If you can cancel any components without doing the math, you must explain why.) m N Direction: (C) (8 pts) Calculate the net electric potential at the origin. V = PROBLEM 1B: (8 pts) The figure on the right shows three media: air, water air and glass with refractive indices as 1.0, 1.33 and 1.5, respectively. A light ray is incident on the air/water surface at an angle of 450. What is the angle of refraction at the water/glass interface? water glass Angle