A metal bar moves to the right in a magnetic field pointing out of the paper, as shown in the figure below. What happens?

  1. The bar feels a force to the right, causing it to accelerate to the right.
  2. Electrons in the bar feel a force upward and collect at the top of the bar, leaving the bottom of the bar with a net positive charge.
  3. It's just a bar moving to the right, dude.