6 4. The following diagram shows two charged spheres arranged to the left of a point in space labelled P. Use the information on the diagram to calculate the magnitude and direction of the net electric field at point P. 9,= -6.75uC 24.5 cm 22.0 22.0 24.5 cm q,=-6.75HC 5. After reading about St. Elmo's fire (refer to pages 555 - 558 of your physics text), answer the following questions. (1 a. Compare the charge distribution on a flat surface to a curved surface, and explain why these distributions occur. 1 b. A metallic conductor has a fixed charge on it. How could you increase the electric field intensity on its surface without adding extra charge? Physics 30 13