Describe, qualitatively, motion in a circular path due to a force perpendicular to the motion as: (a) speed increases if force increases, with mass and radius constant (b) radius decreases if force increases, with mass and speed constant (c) an increased mass requires an increased force to keep speed and radius constant (F = mv²/r is not required)

Recall and use the relative directions of force, magnetic field and current

Recall and use the equation work done = force × distance moved in the direction of the force, W = Fd