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A parallel-plate capacitor has 2.46 cm2plates that are separated by 7.86 mm withair between them.The permittivity of a vacuum is 8.85419 à 10-12 C2/N · m2.If a 12.5 V battery is connected to thiscapacitor, how much energy does it store?Answer in units of J.
Consider the Earth and a cloud layer 900 m above the planet to bethe plates of a parallel-plate capacitor.(a) If the cloud layer has an area of 1.0 km2 = 1000000 m2, what isthe capacitance?_______ F(b) If an electric field strength greater than 3.0 106 N/C causesthe air to break down and conduct charge (lightning), what is themaximum charge the cloud can hold?_______ C