Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Magnets

Intro to Magnets (Principles)
by

Kara LaPietro

on 5 April 2011

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Magnets

Magnets What everyday objects have magnets in them? What is a magnet? Any substance that attracts iron (called ferromagnetic), causes iron to become magnetic, and will point North if a thin piece is floated on water or hung from a string (like a sewing needle). One common magnet is a bar magnet. Polarity Magnets have polarity. The end that points northward is the North pole. The end that points southward is the South pole. Magnets have polarity. The end that points northward is the North pole. The end that points southward is the South pole. Magnets have polarity. The end that points northward is the North pole. The end that points southward is the South pole. What happens when two magnets are brought near each other? Like poles repel and opposite poles attract. WHat happens when metal is placed near a magnet? If a piece of metal is placed near a magnet, the metal may become magnetized.
If it stays magnetic after the magnet is removed, it is a permanent magnet (ie, the alloy Alnico).
If the metal does not stay magnetized after the magnet is removed, it is a temporary magnet (iron).
How do things become magnetized? Magnetism is caused by the spin of the unpaired electrons. When they spin in the same direction, they cause microscopic magnets called domains. If all the domains are aligned, a magnet is formed. Magnetic poles always come in pairs (a single pole cannot be isolated).
If you break a magnet: common magnets Magnetic Field Lines If compasses are placed around a magnet, we can visualize the field around the magnet. In a ferromagnetic material (such as iron filings) are scattered around a magnet we can also visualize the field around a magnet. Field lines point in the direction a compass would point if placed there. Field lines always flow out of North, into South What to know about field lines! Field lines NEVER cross!
Field lines points out of north pole and into south pole.
Field lines form closed loops.
Full transcript