An electron is travelling east through a magnetic field directed south. in which direction is the force on the electron?

Vertically upwards

Explanation:

Fleming's left hand rule: it states taht when we spread our fore finger, middle finger and thumb in such a way that they are mutually perpendicular to each other, theN thumb indicates the direction of force, fore finger indicates the direction of magnetic field and the middle finger indicates the direction of current.

So according to this rule the direction of force is vertically upwards.

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge