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# lect11_handout - 1 Physics 202, Lecture 11 Today’s Topics...

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Unformatted text preview: 1 Physics 202, Lecture 11 Today’s Topics ¡ RC circuit (ch. 28.4) ¡ Magnetic Field (ch. 29.1, 29.2) ¡ Magnetic Field ¡ Magnetic Forces ¡ Between Bar Magnets ¡ Between Bar Magnets ¡ On A Charged Particle ¡ On Current Carrying Wire ¡ Earth Magnetic Field ¡ South Pole or North Pole? (Confusing!) ¢ Expected from preview: north and south poles, Tesla, magnetic field lines, magnetic force…… Charging A Capacitor in RC Circuit £ Find I and q when a capacitor is being charged in a RC circuit (see board). Charging ) 1 ( ) ( / RC t e C t q − − = ε RC t e R t I / ) ( − = ε Note: τ ≡ RC is called time constant ) ( / ) ( = − − dt t dq R C t q ε Discharging A Capacitor in RC Circuit £ Find I and q when a capacitor is being discharged in a RC circuit (After class exercise). RC t Qe t q / ) ( − = discharging RC t e RC Q t I / ) ( − − = Note the time constant τ = RC ) ( / ) ( = + − dt t dq R C t q Demo: RC Circuit r Light Bulb 2 Demo: Magnetism ¡ Bar magnets (Permanent magnetic material)...
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## This note was uploaded on 04/25/2009 for the course PHYS 202 taught by Professor Everett during the Spring '08 term at University of Wisconsin Colleges Online.

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lect11_handout - 1 Physics 202, Lecture 11 Today’s Topics...

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