A capacitor is constructed out of two 1€ coins facing each other in air at a distance of 0.5mm and connected to a voltage source of Vs = 9V. Note: € is the symbol of the European currency as $ is the symbol of the US currency. The permittivity of vacuum is ε0 = 8.854-10-12 F m' The relative permittivity of distilled water is εr = 80. The medium between the coins is still air and the capacity is again 7.52pF. What is the diameter of a 1€ coin? The diameter of a 1€ coin is [Choose ] [Choose ] 11.6 23.2 25.7mm 23.2cm 25.7cm 12.85 11.6mm 11.6cm 25.7 12.85cm 23.2mm 12.85mm
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- Three capacitors having capacitance values of 20F,40F, and 50F are connected in parallel to a 60 - Hz power line. An ammeter indicates a circuit current of 8.6 amperes. How much current is flowing through the 40F capacitor?You are working in an industrial plant. You have been instructed to double the capacitance connected to a machine. The markings on the capacitor, however, are not visible. The capacitor is connected to 560 volts and an ammeter indicates a current of 6 amperes flowing to the capacitor. What size capacitor should be connected in parallel with the existing capacitor? What is the minimum AC voltage rating of the new capacitor? What is the minimum DC voltage rating of the new capacitor? What is the minimum KVAR size that can be used in this installation?All capacitors were initially discharged. at t = 0, S1 is placed at position 1 and S2 is closed. During this phase, it has been determined that Eth and Rth seen by the equivalent capacitor are, respectively, 16 V and 11.0 kΩ. The equivalent capacitor is 1.50 µF. Calculate the time constant for this phase. Enter your answer in ms rounded to 2 decimal places. At t = 15 ms, S1 is placed at position 2 and S2 is kept closed. At t = 25 ms, S1 is kept at position 2 and S2 is opened. Data: R1 = 5 kΩ, R2 = 4 kΩ, R4 = 3 kΩ, R5 = 18 kΩ, R6 = 12.5 kΩ;
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