Answer
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Work Step by Step
This proposal depends on eddy current braking.
As discussed in section 20-6 on page 600, the external magnetic field (from the permanent magnets on the incline) interacts with the mobile conduction electrons in a moving piece of metal to cause a braking effect. The eddy currents appear in the moving metal and experience a magnetic force. By Lenz’s Law, this effect will oppose the original motion of the piece of metal that caused them. Thus, the eddy current braking effect will slow down the pieces of recycled nonferrous scraps that are good conductors (Al, Cu, brass, etc) while not affecting the speed of nonmetallic materials.
The nonmetallic materials are traveling at high speeds at the bottom of the incline. They could be separated from the metallic materials by having the incline transition to a horizontal section, then placing bins at varying distances. The farthest bin catches the fast-moving nonmetallic scraps that travel a long horizontal distance, while closer bins catch the slower nonferrous metal pieces.
