S13Phys2BaLec25C

We turn back to the three top capacitors in parallel

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We turn back to the three top capacitors in parallel (C S , C 3 , and C S ). This means that the charge on C 3 is:

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Clicker Question 25C-1 The equivalent capacitance for a group of capacitors in series is: A) less than any capacitor in the group. B) equal to the smallest capacitance in the group. C) equal to the average capacitance of the group. D) equal to the largest capacitance in the group. E) larger than any capacitor in the group.
Clicker Question 25C-2 Rank in order, from largest to smallest the equivalent capacitance C a to C d of the circuits a to d. A) C d > C b > C a > C c . B) C d > C b = C c > C a . C) C a > C b = C c > C d . D) C b > C a = C d > C c . E) C c > C a = C d > C b .

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Dielectrics The problem with capacitors is that they need to have huge dimensions to carry a significant amount of charge. Cost of material and manufacturing become a problem. The solution is to substitute an electrically insulating material between the parallel-plates instead of air or a vacuum. This is known as a dielectric. When inserted into the capacitor the dielectric will increase the overall capacitance.
Dielectrics The dielectric constant, κ , is the ratio of the new capacitance to the capacitance in a vacuum:

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Dielectrics Easily polarized materials have larger dielectric constants than materials not easily polarized.
Dielectrics Filling a capacitor with a dielectric increases the capacitance by a factor equal to the dielectric constant.

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