IReview | Constants | Periodic Table Part A Storm clouds build up large negative charges, as described in the chapter. The charges dwell in charge centers, regions of concentrated charge. Suppose a What is the approximate magnitude of the electric field between the charge center and the ground? cloud has -25 C in a 1.0-km-diameter spherical charge center located 10 km above the ground, as sketched in (Figure 1). The negative charge center attracts a similar O 4.8 x 10* V/m amount of positive charge that is spread on the ground below the cloud. O 4.8 x 105 V/m Figure O 4.8 x 106 V/m O 4.8 x 10' V/m Submit Request Answer I km -25 C Part B 10 km Which of the curves sketched below best approximates the shape of an equipotential drawn halfway between the charge center and the ground