Consider the following diagram:
- In the first diagram, the wire is carrying current into the screen. Motion of the wire is downwards (Left Hand Rule)
- In the second diagram, the wire is moved downwards, and a current is induced, flowing out of the screen (Right Hand Rule)
In both cases, the direction of motion is the same (downwards) but the direction of Current is opposite.
When we compare the Right and Left Hand Rules, we find that there is always one of the three, either Current, Magnetic Field, or Force (Motion), who's direction is changing. Why does this happen?