1) Two large equipotent surfaces are flat & parallel & separated by a relatively small distance compared to their size. One surface is at 25 V & the other is at 33 V. The surfaces are 1.25 cm apart. What is the direction of the electric field midway between the surface?
2) Three point charges, q1=2.0 uc, q2=2.0 uc, & q3= -1.0 uc, are located at the vertices of an equilateral triangle of side length 30 cm. What is the potential energy of this arrangement?