In the figure, a conducting rod is shown moving in a uniform magnetic field. After the free charges in the bar have stopped moving up or down the bar, which of the following statements are true? Check all that apply. Supporting Material In the figure, a conducting rod is shown moving in a uniform magnetic field. After the free charges in the bar have stopped moving up or down the bar, which of the following statements are true? Check all that apply. Supporting Material The magnitude of the potential difference in the rod is proportional to the strength of the magnetic field. The magnitude of the potential difference in the rod is inversely proportional to the length L of the rod. The free charges in the rod are acted upon by a magnetic force. The magnitude of the potential difference in the rod is proportional to the velocity v of the rod. An electric field is established in the rod directed from point a to point b