# lecture12 - Capacitance (II) Capacitance apacitors in...

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Capacitance (II) Capacitance (II) Capacitors in circuits Electrostatic potential energy

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Example Example Conducting spheres and a long wire: cm r 10 1 = cm r 30 2 = A total charge +12 C is placed on one sphere. The charge will move to the μ other sphere until A) the electric fields on the spheres are equal B) the electric potentials on the spheres are equal C) the electric charges on the spheres are equal
Capacitors in Circuits Capacitors in Circuits Symbols: or Capacitor Battery Switch + + - -

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Capacitor Combinations Capacitor Combinations A B Series A B Parallel What is the “effective capacitance ” between A & B? A B +Q -Q charge held voltage difference eff C =
Parallel Parallel C 1 C 2 C 3 A B V Voltages are the same : V 1 = V 2 = V 3 = … = V Charges add : Q Q Q Q = + + + ... 3 2 1 But… ... , , 2 2 1 1 V C Q V C Q = = ... 2 1 + + = C C C eff 1 2 ...... eff Q Q C V + + =

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Series Series Voltages add : V V V = + + ... 2
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## This note was uploaded on 01/13/2011 for the course PHYSICS Physics 1E taught by Professor Venus during the Winter '03 term at McMaster University.

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lecture12 - Capacitance (II) Capacitance apacitors in...

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