Hello I do not understand one of the problems in my SAT Physics book. 1. The problem statement, all variables and given/known data The subsequent path of the electron is... . the answer for this given by the book is : Spiral or Helix (It does not exist any picture in the book to this question.) The explanation the book gives for this answer is: The electron will orbit a magnetic field line but will also continue to move towards the bottom of the page , spiraling downwards. My question for this is Why is it moving that way? There is no explanation given. This question is out of the SAT Subject Test: Physics from Kaplan. It would be nice to get an answer soon. I am studying SAT Physics in a Club, so we all have got the same problem with this.