2049_ch29A - Chapter 29: Creating Magnetic Fields PHY2049:...

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PHY2049: Chapter 29 1 Chapter 29: Creating Magnetic Fields
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PHY2049: Chapter 29 2 Creating Magnetic Fields Î Sources of magnetic fields ± Spin of elementary particles (mostly electrons) ± Atomic orbits (L > 0 only) ± Moving charges (electric current) Î Currents generate the most intense magnetic fields ± Discovered by Oersted in 1819 (deflection of compass needle) Î Three examples studied here ± Long wire ± Wire loop ± Solenoid
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PHY2049: Chapter 29 3 B Field Around Very Long Wire Î Field around wire is circular, intensity falls with distance ± Direction given by RHR (compass follows field lines) 0 2 i B r µ π = 7 0 41 0 µπ Right Hand Rule #2
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PHY2049: Chapter 29 4 Long Wire B Field Example Î I = 500 A toward observer. Find B vs r ± RHR field is counterclockwise ± r = 0.001 m B = 0.10 T = 1000 G ± r = 0.005 m B = 0.02 T = 200 G ± r = 0.01 m B = 0.010 T = 100 G ± r = 0.05 m B = 0.002 T = 20 G ± r = 0.10 m B = 0.001 T = 10 G ± r = 0.50 m B = 0.0002 T = 2 G ± r = 1.0 m B = 0.0001 T = 1 G () 7 0 4 10 500 0.0001 22 i B rrr π µ × == =
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PHY2049: Chapter 29 5 Charged Particle Moving Near Wire Î
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This note was uploaded on 04/12/2008 for the course PHY 2049 taught by Professor Any during the Fall '08 term at University of Florida.

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2049_ch29A - Chapter 29: Creating Magnetic Fields PHY2049:...

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