In order for work to take place select one: a. the energy present must be related to the movement of the object. b. the force applied must be a balanced force resulting in motion of the object. c. the force applied must cause the movement of the object in the same direction as the force. d. the movement of the object must be the cause of the force.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?