After changing the km into meters
(9*10^9) * (40) * (-40) / 1000^2
this gave me answer of = - 14400000
this answer seems a little big. or is it meant to be this large?
Sorry if i have posted under the wrong catagorie physics is new to me so I am still getting my head around it.
Here is the question that is giving me a bit of bother;
An airplane is flying through a thunder cloud at an altitude of 2km. If the cloud has a charge concentration of 40C at an...