Lecture-18-03-18-08

Lecture-18-03-18-08 - Lecture-18 Lectures thus far covered...

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1 Lecture-18 Lectures thus far covered: Electrostatics in vacuum and with dielectrics Magnetic fields due to electric current: a line current, a long solenoid, a toroid, a fat wire and a coaxial cable. Magnetic Field is non-conservative Induced electric field due to changing B-flux Induced magnetic field due to changing E-flux Steady magnetic fields in vacuum: What happens if in material medium? Materials in Magnetic Field Experimental Fact: If an iron core is placed within a solenoid, the magnetic field becomes MUCH stronger. Different kinds of magnetic materials: Ferromagnetic; Paramagnetic; and Diamagnetic = = i i o enclosed o I I l d B μ r r
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2 Atomistic Origin of Magnetism Electron spin An electron has intrinsic spin angular momentum and associated spin magnetic dipole moment , where Note that is quantum mechanical quantity. Electron o rbital magnetic dipole moment An orbiting electron inside an atom has orbital angular momentum L orb and associated orbital magnetic dipole moment . For orbiting electron, μ orb =i ( π r 2 ), where i = charge/time. But and is anti-parallel to . Therefore S r s r S r orb r 2 / 2 2 r e r r e orb υ = = orb orb L m e r r 2 = S m e s r r = z mr L orb ˆ = r orb r
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3 is also quantum mechanical
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This homework help was uploaded on 03/30/2008 for the course PHYSIC 2 taught by Professor Kim during the Spring '08 term at Lehigh University .

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Lecture-18-03-18-08 - Lecture-18 Lectures thus far covered...

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