force F experienced by a particle having charge q & velocity v in magnetic field B is given by F=q(v×B).what is the direction of force acting on electrons falling vertically downward at a place where the earth`s magnetic field is horizontal pointing towards north?

The electron is falling vertically downwards so the direction of current will be vertically upward.. By using flemings left hand rule- i-vertically up....... B-towards north..... so F-towards westOr if u want to find ans using eqtn f=q (v×B) (Always consider that we are sitting in south)So now, v=+j B=-k so j×-k=-i :)