Suppose I have a plastic tube about 70% full with magnetic powder, with a copper coil solenoid around the cylinder. By "magnetic powder" I mean each particle is actually a tiny permanent magnet with its own magnetic field. - like you can see in this video When there is no externally applied magnetic field, the particles of the powder do their best to clump together and find north and south poles to complete their magnetic circuit. What happens when we turn on the solenoid? How would the magnetic powder react? Would the orientation of resulting magnetic field resemble that of a standard iron core electromagnet? (like the one shown here - http://www.pirate4x4.com/tech/billavista/Wiring/Part2/images/elmag_400.jpg ) Would the magnetic field of the powder interfere with the field in the current carrying copper?