A Hollow Copper Pipe Is Held Vertically, and a Magnet

question 4

Multiple Choice

A hollow copper pipe is held vertically, and a magnet is dropped down the pipe. The magnet is oriented with its north pole down. What direction do the eddy currents flow as viewed from above the pipe? If copper bar of approximately the same size and weight as the magnet is dropped down the tube instead, will it fall faster or slower than the magnet?

• A) CCW above the magnet and CW below the magnet; copper bar will fall slower
• B) CCW above the magnet and CW below the magnet; copper bar will fall faster
• C) CW above the magnet and CCW below the magnet; copper bar will fall slower
• D) CW above the magnet and CCW below the magnet; copper bar will fall faster