PHY2049ch32B%283-26-10%29

PHY2049ch32B%283-26-10%29 - Magnetic materials 3 general...

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dipole moments , but they develop magnetic moments in response to an applied external field . Magnetic materials Atoms of these materials have no intrinsic magnetic Diamagnetic – ext B G The induced magnetic moments are directed opposite to the direction of the applied field so that in a non–uniform external field the material is repelled from the high field region. N S repelled from high field region The induced moments vanish when the external field is removed. This repulsion can be used to float a diamagnetic object in the diverging field at the top of strong electromagnet. 3 general categories (dia-, para, ferro-magnetic) μ induced N S http://www.youtube.com/watch?v=m-Al7GAnH8Q
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In the presence of an external magnetic field, ,these magnetic moments are reoriented to lie along the external field . Accordingly in a non–uniform field paramagnetic materials are drawn to the high field region . Magnetic materials Atoms of these materials possess intrinsic magnetic Paramagnetic – ext B G S N When is removed the moments of the material
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PHY2049ch32B%283-26-10%29 - Magnetic materials 3 general...

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