A thin-walled metal spherical shell of radius a = 5 m has a charge qa = 31 C. Concentric with it is a thin-walled metal spherical shell of radius b = 7a and charge qb = 33 C. Find the electric field at points a distance r from the common center, where (a) r = 1.5 m, (b) r = 10 m, and (c) r = 52.5 m.

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation