2c c preflight4 preflight4 which has lowest total

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Unformatted text preview: l capacitance: C C C C Ctotal = C 1/Ctotal = 1/C + 1/C = 2/C Ctotal = C/2 70 60 50 40 30 20 10 18 0 Ctotal = 2C C Preflight 4 Preflight 4 Which has lowest total capacitance: C C C C C Cleft = C/2 Ctotal = C Ctotal = Cleft + Cright 70 Ctotal = C 50 40 30 20 10 0 20 Same 60 Cright = C/2 Similar to Preflight 6 Similar to Preflight 6 C2 V0 V1 C1 Q2 BB V2 Q1 V3 Ctotal Which of the following is NOT necessarily true: A) B) C) D) E) 24 V0 = V1 Ctotal > C1 V2 = V3 Q2 = Q3 V1 = V2 + V3 C3 Q3 Preflight 6 Preflight 6 BB NO YES NO YES NO YES V1 = V 2 + V 3 Q2 = Q3 Q1 Q2 Q2 = + C1 C2 C3 Q1 = Q2 V1 < V2 25 V1 > V2 Q1 = Q2 V1 < V2 (A) (B) Q2 = C2C3 Q1 C1 (C2 + C3 ) Q1 = Q2 V1 < V 2 Q1 = Q2 V1 < V2 (C) (D) Energy in a Capacitor Energy In pre-lecture 7 we calculated the work done to move charge Q from one plate to another: plate C +Q V -Q U = 1/2QV = 1/2CV2 =1/2Q2/C This is potential energy waiting to be used… This 26 Since Q = VC Messing w/ Capacitors • If connected to a battery V stays constant V1 = V V C1 = κ C κ Q1 = C1V1 = κ CV = κQ • If isolated then total Q stays constant κ Q1 = Q C1 = κ C V1 = Q1/C1 = Q/κC = V / κ Preflight 8 Preflight 8 BB 60 “q is constant. the capacitance is increased thus voltage must be reduced.” (DH) “Dielectrics do not effect voltage....
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