application of magnetic fields?

Question

give some examples

Answer 1

Magnetosphere propulsion.

Answer 2

Motors and Generators both use magnetic fields to operate. The modern junkyard would be a lonely place without the electromagnetic crane; used to pick up junk. It is especially useful when crushing cars; that's three right there.

BotanyDave beat me to the Levitating Frogs, but he only hinted at magnetic levitation which is used to run and power all of the bullet trains that are famous in Europe and Japan for running close to 200 mph.

He also didn't mention the Magnetic Image Resonancer (MRI) The MRI machine uses a huge magnetic field to magnetize all the hydrogen in your body and it uses that to create detailed images.

Then there is the Computer Monitor or Television. Before LEDs and Plasma TVs the cathode ray tube was used to create a TV image or an image on a monitor. The Cathode ray tube uses a beam of electrons to charge the phosphors on the screen making them glow. The amount of energy determines the brightness, and if you cluster the phosphors in blocks of red, blue and green, then you can fire at only some phosphors to create various colors. The electron beam is guided by a magnetic field.

Your hard drive uses a magnetic field to store its memory as did the old floppy disks.

Your kitchen probably has magnetic catches on the doors so they stay closed until you open them, almost all do. Your refrigerator might have magnetic note holders on it as well. Many chip clips have a magnetic on them just of that use.

Your analog speedometer or any analog meter is a steel needle suspended in a magnetic field. The strength of the field determines the reading on the meter.

The best gyroscopes, like those used on the shuttle or the Hubble Space Telescope use gyroscopes that are suspended in a magnetic field to cut down on friction so they can spin faster and won’t have any bearings to wear out.

The humble compass is used to determine north and south by billions of people.

When you want to find a stud in a wall behind some drywall the accepted method is to look for the nails. A simple device uses a magnet that lies at an angle and jumps when it runs over a nail. When that happens you have found a nail where the dry wall is nailed to a stud.

Like he said the uses of magnetism are endless, especially in electronics.

I think any more text would just be spam; so if you need more then look at this article and study magnetism: http://en.wikipedia.org/wiki/Magnetic_field

Answer 3

Set up a giant magnetic field in migratory bird flight paths to throw them off. (Were' eatin' goose this winter!)

Spin N and S magnets over a conductive surface to induce a magnetic field that repells the spinning magnets- producing a form of magnetic levitation.

Of course, you can always play around with levitation and type II superconductors.

Or diamagetism... near-frictionless bearings are in the research/prototype stage.

Levitating frogs in a tube for fun and profit.

Inducing electrical current (AC).

Oh, gee, the list will surely go on...

Answer 4

Geophysicists use them to determine what types of rocks lie beneath our feet. A common example: if a huge mass of magnetite was hidden a short way into the earth, it could easily be detected on the surface with the use of magnetometers.