[SOLVED] Magnetic and electrical forces 1. The problem statement, all variables and given/known data 1) A proton traveling due north enters a region that contains both a magnetic field and an electric field. The electric field points due east. It is observed that the proton continues to travel in a straight line due north. In which direction must the magnetic field lines point? A) North B) Down C) Up D) South E) West F) East 2) A proton traveling due west in a region that contains only a magnetic field experiences a force vertically upwards away from the surface of the earth. What is the direction of the magnetic field? A) West B) East C) North D) South E) Up 2. Relevant equations 3. The attempt at a solution For #1 i know it isnt up or north I have tried those but this is how i came about those answer: the proton is moving north and the electric field points due east so that would force the proton to to move into the direction of the electric field which is east.... the magnetic field causes the proton to keep moving north but im not really sure how this works...i know it isnt up or north but i dont know how to eliminate the others #2- I know i have to use the right hand rule and i came out with south but i dont fully understand how it works so any hints?