You have correctly positioned the magnet to produce zero magnetic field at the origin. Which of these changes to the problem setup would still yield zero magnetic field at the origin? Select all that apply. * Flip the sign of each charge; velocities, current and magnet remain unchanged. ?

* Flip the sign of each charge and flip the magnet over; velocities and current remain unchanged. ?

* Flip the sign of each charge, flip the magnet over, and flip the direction of the current; velocities remain unchanged.

? * Flip the sign of each charge and the direction of their velocities; current and magnet remain unchanged.

? * Flip everything: charges, velocities, current and magnet.

C. [6 points] You have correctly positioned the magnet to produce zero magnetic field at the origin. Which of these changes to the problem setup would still yield zero magnetic eld at the origin? Select all that apply. A. Flip the sign of each charge; velocities, current and magnet remain unchanged. B. Flip the sign of each charge and ip the magnet over; velocities and current remain unchanged. C. Flip the sign of each charge, ip the magnet over, and ip the direction of the current; velocities remain unchanged. D. Flip the sign of each charge and the direction of their velocities; current and magnet remain unchanged. E. Flip everything: charges, velocities, current and magnet. 3d IQ 2d +~1Q 40 d I ,t', o _d |