电容与电容器.pdf

1 1 CVq C 2 R q R Q V 0 4πε 2 R4C 0 πε 3 F 1 F 1 CV F IF 9 109 m 6.4 106m 10-6F 10-9 pF 1 F 10-6 F IpF 10-3 F 10-9F 1 q-q V 3 2 2-28 B A A B B A B A B 2-28 A B - - - - - - - - 4 21 UU q C − 2-29 5 1 2-30 S d q dEdl dEU e ab ⋅ 0 ε σ 2-30 d S U q C ab 0 ε S d q -q a b 6 2 A RA B RBA q B q 2 0 4r q E πε 2-31 11 4 0BA b a ab RR q dlEU−⋅ πε RA RB A B 7 AB BA ab RR RR U q C − 0 4πε RBRA B A RA RB RB RAd RARBR2, 3 A B RA RB L LRB-RA η E r E 0 2πε η A B R R ab R R dr r U B A ln 22 00 πε η πε η qηL, A B RA RB L 2-32 8 A B ab R R L U q C ln 2 0 πε 1 C1C2C3⋅⋅⋅Cn n C n i i CC 11 2-33 U C1 C2 C3 C4 9 2 C1C2C3⋅⋅⋅Cn n C n i i CC 2-34 U C1 C2 C3 10 1 2