Which part of a map would you look at to find directions on a physical map?When a geographer studies the migration patterns of humans over many centuries and how that has affected the geography of North America, which theme of geography is he or she using?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.