scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 1,023
For levitation in ancient times men knew of a special kind of rock that could pull other rocks of the same kind and pieces of iron toward themselves They were called lodestones Today man uses the same force exerted by electromagnets and permanent magnets to provide magnetic aide to trains and more efficient power generators Magnetism is defined as the force exerted by a magnetic field A magnetic field is defined as the energy exerted by the magnet It is caused by the alignment of the domains sub-atomic particles of an object When the domains are lined up they produce magnetism When the domains are not lined up then they cause the object to be demagnetized having no magnetic power Materials such as air wood copper and water do not respond to the power of magnets Electromagnets like permanent magnets have poles and magnetic fields Actually whenever an electrical current passes through a wire it produces a magnetic field Every electrical appliance or cord has a weak magnetic field around it The difference between an electromagnet and a permanent magnet is that you can reverse direction of the current in an electromagnet The greatest electromagnet that is known today is the Earth The planets magnetism comes from electronic currents deep within the Earth Scientists believe that there is a region of molten iron surrounding the Earths core Scientists can determine changes in the Earths magnetic field by studying old maps The Earths poles have drifted ad continue to drift westward Small electronic needles have been found in the Earth that are frozen pointing at an old north pole close to what is now the south pole It is believed that the Earths poles have actually reversed Some people talk about animal magnetism as a metaphor Most people do not know that it actually exists There are very weak magnetic fields around humans The field can be detected by the Superconducting Quantum Interference Device
@Kibin is a lifesaver for my essay right now!!
- Sandra Slivka, student @ UC Berkeley
Wow, this is the best essay help I've ever received!
- Camvu Pham, student @ U of M
If I'd known about @Kibin in college, I would have gotten much more sleep
- Jen Soust, alumni @ UCLA