1. The problem statement, all variables and given/known data If a flat wire lies in a north-south direction will the MAXIMUM magnetic force be felt if the field lies either in a east-west direction OR an up-down direction (i.e: ppd to the direction of the current?)?? 2. Relevant equations 3. The attempt at a solution I know that the maximum magnetic force is felt when the current and field are perpendicular BUT does it matter which plane the magnetic field is in so long as it is perpendicular? Also, in exams will it be clear which direction the field is in (e.g: they might say it acts at a 40 degree angle to the horizontal) therefore if the current is straight ahead I calculate the component perpendicular to the direction of the current to find the force??