OpenStax University Physics/E&M/Capacitance

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(Vol. 2):    5:Electric Charges and Fields    6:Gauss's Law    7:Electric Potential    8:Capacitance    9:Current and Resistance    10:Direct-Current Circuits    11:Magnetic Forces and Fields    12:Sources of Magnetic Fields    13:Electromagnetic Induction    14:Inductance    15:Alternating-Current Circuits    16:Electromagnetic Waves


Chapter 8[edit | edit source]

Capacitance[edit | edit source]

defines capacitance. For a parallel plate capacitor, where A is area and d is gap length.

▭  and for a spherical and cylindrical capacitor, respectively
▭ For capacitors in series (parallel)
▭  ▭ Stored energy density
▭ A dielectric with will decrease the capacitor's electric field and stored energy , but increase the capacitance due to the induced electric field

For quiz at QB/d_cp2.8[edit | edit source]

defines capacitance.

where A is area and d<<A1/2 is gap length of parallel plate capacitor


= stored energy

= energy density