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2. Harbor Freight Coupon for 20% Off - AOL

   www.aol.com/news/2011-02-16-harbor-freight...

   Replace old tools or get new ones with this Harbor Freight coupon for 20% off any one item. Expires Feb. 19, 2011. Valid in store, online, or over the phone. Use coupon code 74990607 online or ...

3. Rebate (marketing) - Wikipedia

   en.wikipedia.org/wiki/Rebate_(marketing)

   For example, an item might be advertised as "$39 after rebate" with the item costing $79 out-the-door with a $40 rebate that the customer would need to redeem. Sometimes discounts are given at the point of sale rather than the manufacturer providing rebates, eliminating the need for coupons or mail-in rebates.

4. Rare-earth magnet - Wikipedia

   en.wikipedia.org/wiki/Rare-earth_magnet

   Ferrofluid on glass, with a rare-earth magnet underneath. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements.Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.

5. Ferrite (magnet) - Wikipedia

   en.wikipedia.org/wiki/Ferrite_(magnet)

   This can be done by magnetic annealing, [27] magnetic field assisted compaction, [28] or reaction under uniaxial pressure. [29] This last solution has the advantage to be ultra fast (20 min) thanks to the use of spark plasma sintering. The induced magnetic anisotropy in cobalt ferrite is also beneficial to enhance the magnetoelectric effect in ...

6. Magnetic field - Wikipedia

   en.wikipedia.org/wiki/Magnetic_field

   In this model, a magnetic H-field is produced by fictitious magnetic charges that are spread over the surface of each pole. These magnetic charges are in fact related to the magnetization field M. The H-field, therefore, is analogous to the electric field E, which starts at a positive electric charge and ends at a negative electric charge.

7. Eddy current - Wikipedia

   en.wikipedia.org/wiki/Eddy_current

   The magnetic field (B, green) is directed down through the plate. The Lorentz force of the magnetic field on the electrons in the metal induces a sideways current under the magnet. The magnetic field, acting on the sideways moving electrons, creates a Lorentz force opposite to the velocity of the sheet, which acts as a drag force on the sheet.