Neodymium magnet
"They have replaced marginally weaker and significantly more heat-resistant samarium-cobalt magnets in most applications, due mainly to their lower cost.
Used for stabilization and angular head motors in computer hard drives, neodymium magnets are also popular with hobbyists, and a small magnet can have amazing properties — it exhibits magnetic braking when moved near a non-magnetic metal due to induced eddy currents. An excellent demonstration for students to see the effects of Lenz's Law in non-ferrous metals may be performed by dropping a strong neodymium magnet through a copper pipe. The magnet will travel through the pipe remarkably slowly as it falls. The effect may be greatly enhanced by immersing the pipe in liquid nitrogen (thus increasing its conductivity even further) prior to dropping the magnet through." Wiki - "Neodymium magnet"
Well thats getting closer to answering one question of mine. Someone help me out here. When you drop the magnet through the copper pipe why does it get friction, is it due to a weak magnetic attraction to the copper? I read len's law and had a hard time understanding it, mainly because lots of thwe answers where math equations i don't understand.
"it exhibits magnetic braking when moved near a non-magnetic metal due to induced eddy currents"
Is it saying that the magnet actualy gets friction from just generating electricity even with a non-magnetic metal? If so then that would mean the the generator having zero friction bearings would be pointles unless cheaper, because the friction from actually generating the electricity may be higher than the normal bearings generators use, liquid bearings being good enough because there friction is lower than induced eddy currents??
"They have replaced marginally weaker and significantly more heat-resistant samarium-cobalt magnets in most applications, due mainly to their lower cost.
Used for stabilization and angular head motors in computer hard drives, neodymium magnets are also popular with hobbyists, and a small magnet can have amazing properties — it exhibits magnetic braking when moved near a non-magnetic metal due to induced eddy currents. An excellent demonstration for students to see the effects of Lenz's Law in non-ferrous metals may be performed by dropping a strong neodymium magnet through a copper pipe. The magnet will travel through the pipe remarkably slowly as it falls. The effect may be greatly enhanced by immersing the pipe in liquid nitrogen (thus increasing its conductivity even further) prior to dropping the magnet through." Wiki - "Neodymium magnet"
Well thats getting closer to answering one question of mine. Someone help me out here. When you drop the magnet through the copper pipe why does it get friction, is it due to a weak magnetic attraction to the copper? I read len's law and had a hard time understanding it, mainly because lots of thwe answers where math equations i don't understand.
"it exhibits magnetic braking when moved near a non-magnetic metal due to induced eddy currents"
Is it saying that the magnet actualy gets friction from just generating electricity even with a non-magnetic metal? If so then that would mean the the generator having zero friction bearings would be pointles unless cheaper, because the friction from actually generating the electricity may be higher than the normal bearings generators use, liquid bearings being good enough because there friction is lower than induced eddy currents??