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Mag. Field - PHY 2049C General Physics B Fields Circuits...

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) RC-circuits 2) Magnetic Fields
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RC-Circuits: Discharging a Capacitor A capacitor is charged with charge Q 0 , V = Q 0 /C Switch is closed, current can flow. Kirchhoff's loop: / / 0 0 , 0 0 ( ) , ( ) t RC t RC Q dQ IR I C dt Q dQ R C dt dQ Q dt RC Q t Q e I t I e = − + = + = = =
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