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78. . Figure P22.78 shows a series of equipotential curves. a. Is the electric field strength at point A larger than, smaller than, or equal to the field strength at point B? Explain. b. Is the electric field strength at point C larger than, smaller than, or equal to the field strength at point D? Explain. c. Determine the electric field E at point D. Express your answer as a magnitude and direction. Figure P22.78 y (cm) 2- 2V 1- - -IV B - - --2V T x (cm) 2 79. . . . Metal sphere 1 has a positive charge of 6.0 nC. Metal sphere 2, which is twice the