An airplane is ying through a thundercloud at a height of 2 000 m. (This is a

An airplane is flying through a thundercloud at a height of 2 000 m. (This is a very dangerous thing to do because of updrafts, turbulence, and the possibility of electric discharge.) If there are charge concentrations of + 40.0 C at a height of 3 000 m within the cloud and − 40.0 C at a height of 1 000 m, what is the electric field E at the aircraft?