Two small objects each with a net charge of q (positive) exert a force of magnitude f on each other. we replace one of the objects with another whose net charge is 4q. the original magnitude of the force on the q charge was f; what is the magnitude of the force on the q now?
a. 16f
b. 4f
c. f
d. f/4

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,?