Wo small pith balls, each carrying a charge q, are attached to the ends of a light rod of length d, which is suspended from the ceiling by a thin torsion- free fiber. There is a uniform magnetic field B, poi If the magnetic field is turned off, which of the following describes what happened to the system? nting straight down, in the cylindrical region of radius R around the fiber. The system is initially at rest TrueIt does not rotate because to do so would violate conservation of angular momentum FaiseIt rotates with angular momentum qBd/4 True It does not move because magnetic forces do no work Fase It rotates with angular momentum qBR True It rotates with angular momentum qBRd/2