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        Q: Major confusion on capacitor questions in Physics?
A: A capacitor , previously Condenser , is two conductive plates seperated by a nonconducting dielectric . Foil on the within and outside of a foam cup is a crude capacitor ; a `` Leyden Jar '' . They can hold a charging of DC electricity whilst they will pass an AC current .   Do you mean , MicroFarad ? If so ; 9v x 200 x10 -6 = .0018 coulomb of charging . 

Q: What is a capacitor?how it works?what is function of capacitor?uses of capacitor?
A: A capacitor storing accumulated charging as voltage . The stockpiling and discharging of these charging help regulate voltagein circuits . As the switching frequency of storing or discharging increased the'frequency dependent resistance ' or reactance decreased and appearsas a short circuit at endless frequency . The capacitor appears as a opening circuit at 0 frequency . 

Q: Which powerful electrolytic capacitor or mylar capacitor?
A: In an electrolytic capacitor the dielectric is a thin corrosion layer formed on the surface area of a metal plate , the other plate of the capacitor is a humid electrolyte pasting . Thbe extremely thin dielectric enabling electrolytic capacitors to have extremely high values of capacitance in little packagings , but has two disadvantaged : low breakdown voltage & polarisation of the capacitor . It be extremely significant that the polarity of an electrolytic capacitor not be inverted . If the polarity is inverted the thin corrosion layer undermines till the capacitor has no dielectrical and shorts out , allowing electrolyses to produce hydrogen and oxygen gas in the moist electrolyte pasting . The gas pressure ultimately surges to the point that the case ruptures and the capacitor explosions .