שבעה דברים מגניבים שלא ידעתם על מגנטים | בקטנה

Ready to fly on magnetism Let's take off Just be careful not to get magnetized yourself Maglev trains float slightly above the track using magnetic repulsion Trains and tracks have powerful magnets arranged so they repel each other The levitation maintains a small gap above the track almost frictionless allowing the train to move quietly and extremely fast Deep within the Earth's crust lies a hot core with constantly shifting liquid currents These shifting electric fields generate electric currents which in turn produce a large magnetic field surrounding the entire Earth Birds sea turtles and even fish have delicate magnetic particles in their bodies A type of natural magnetic stone that senses Earth's magnetic field Their brains receive signals from the magnetic field much like a compass allowing them to know which direction to head toward either north or south Even when it comes to thousands of kilometers between continents In 1831 British scientist Michael Faraday discovered that an electric current could be generated by moving a magnet near a coil of wire This is called electromagnetic interference Thanks to this discovery large magnets are used as part of the process of generating and transmitting electricity from the power station directly to the outlets in our home The Haggadah tells of a young shepherd named Magnes who lived in the region of Magnesia in ancient Greece He continued on his way with his absence when by chance he passed a stone known as Lodestone The nails in his sandals stuck to the stone thus revealing the magnetite ore named after the region where it was discovered How does a compass work It contains a magnetized piece of iron It aligns with Earth's magnetic field and thus points toward the north The two scientists Gay and Webb used a laboratory with a giant magnetic field Most materials including water and diamonds are slightly diamagnetic that is they repel magnets and move away from them albeit very slightly The two scientists demonstrated that with an extremely strong magnetic field even a frog can be levitated in midair Yes literally made to float in the air Don't try this at home These are the strongest magnetic fields that will pull you in We received your responses and you might just win a compass magnetic stone or even a flying frog