The diagram illustrates a wire placed in the magnetic field between the two poles of a magnet. As the graph shows, the current in the wire alternates repeatedly between a steady value in one direction and a steady value in the opposite direction. What happens to the wire?
- AThe force on the wire alternates between one direction and the opposite direction.
- BThe force on the wire is constant in size and direction.
- CThere is no force acting on the wire at any time.
- DThere is only a force on the wire when the current reverses.