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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 4 10 µ π = × 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 2 2 i B r r r π µ π π × = = =
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PHY2049: Chapter 29 5 Charged Particle Moving Near Wire Î Wire carries current of 400 A upwards Proton moving at v = 5 × 10 6
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