Consider a rectangular conducting loop being pulled out of a uniform magnetic field $B$ (into the page) at constant velocity $v$. The current in the loop flows in which direction, and which type of force does the field exert on the loop?

As the loop exits, flux **decreases**. By Lenz, induced current opposes the decrease — it must flow so as to maintain the inward flux, i.e. **clockwise** (right-hand rule). This clockwise current in the field experiences a force $F = IL \times B$ that points **into** the field — opposing the pulling motion. (Energy conservation: mechanical work pulling = electrical energy dissipated.)