1. The problem statement, all variables and given/known data The acceleration of an electron in a magnetic field of 87 mT at a certain point is 1.268×1017 m/s2. Calculate the angle between the velocity and magnetic field. 2. Relevant equations F = q dot v cross B F = qBsin(theta) F/m = a 3. The attempt at a solution I calculated the force on the electron using F/m = a rearranged to F = ma, then plugged F into F = qBsin(theta). I came up with sin-1(8243000) = theta, which is obviously incorrect. Am I making a calculation error, or is there an error with my formulas? In advance, any help is much appreciated and thank you.