The diagram illustrates a wire placed in the magnetic field between the two poles of a magnet. The current in the wire keeps switching between a constant value in one direction and a constant value in the opposite direction, as the graph shows. What effect does this have on 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.