Find the outer radius of a coaxial cable having a characteristic impedance of 12 and a dielectric constant of 0.06. The outer inner radius of this cable is 4 cm.
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1. Find the outer radius of a coaxial cable having a characteristic impedance of 12 and a dielectric constant of 0.06. The outer inner radius of this cable is 4 cm.
2. How much is the inductance of a coil of an instrument that induces 1000 V when its current changes at the rate of 50 mA in 2 µs
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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?4. In what form is the energy of a capacitor stored?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?
- Ex Por finding the capacitance of Coaxial cable Let the potential between the two conductors is Vo Inner vadies a outer radies bWhich of the statements below are correct I. Capacitors use electric field to store current. II. Inductance is increased with permeability of the core material. III. Capacitance of a capacitor decreases with the increasing permittivity of the dielectric. IV. Current of an inductor can not change abruptly. a. Il and IV b. I and || C. None d. III and IV e. Il and IIAn inductor is constructed by winding a coil of 100 turns around a magnetic core. The core is a cylinder with radius 0.5 cm and the core material has relative permeability of 1000. The coil covers a length of 10 cm. Determine the resulting inductance. Enter your answer in mH rounded to two decimal places.
- Kindly answer the questions below.1. The current through a 100-mH coil is changing at a rate of 200 mA/s. How much voltage is induced across the coil? a. 0.02 V b. 0.2 V c. 0.002 V d. 2 V 2. Two capacitors connected in parallel across a 250-V mains have charges of 3,000 µC and 5,000 µC, respectively. Find the total capacitance of the combination. a. 7,000 µC b. 8,000 µC c. 6,000 µC d. 5,000 µC 3. A 0.4-mF capacitor has a charge of 20 mC. How much is the voltage across it? a. 40 Vb. 30 Vc. 50 Vd. 25 VFind the distance in mils between the plates of a 2 µF ca- pacitor if the area of each plate is 0.15 m² and the dielectric is transformer oil. 11. The capacitance of a capacitor with a dielectric of air is 1200 pF. When a dielectric is inserted between the plates, the capacitance increases to 6 nF. Of what material is the di- 10. electric made? 12. The plates of a parallel plate air capacitor are 0.2 mm apart and have an area of 0.08 m², and 200 V are applied across the plates. a. Determine the capacitance. b. Find the electric field intensity between the plates. c. Find the charge on each plate if the dielectric is air. 13. A sheet of Bakelite 0.2 mm thick having an area of 0.08 m? is inserted between the plates of Problem 12. a. Find the electric field strength between the plates. b. Determine the charge on each plate. c. Determine the capacitance. 14. A parallel plate air capacitor has a capacitance of 5 µF. Find the new capacitance if: a. The distance between the plates is doubled…Q19. Four capacitors of lµF , 3µF ,5µF and ,6µF are connected in series across 360V AC- supply. Evaluate the following: i. Equivalent Capacitance in terms of µF ? ii. Charge on each capacitor in terms of µC ? iii. Voltage across each capacitor?
- A certain parallel-plate capacitor consists of two plates, each with area 200 cm2, separated by a 0.4 cm air gap. If the capacitor is connected across a 400-V source. Draw the diagram a. Determine the energy stored on it. b. Determine the energy stored if there is a dielectric material with constant of 2.5 inserted between the plates.1. a) Calculate the capacitance in Pico farad of a parallel-plate capacitor having plates 10 cm by 30 cm separated by 0.01 mm and the dielectric has relative permittivity of 15. (2 Marks) b) For the circuit shown in Figure 1, determine: i. The total capacitance of the circuit ii. The total energy stored in the circuit iii. The charges in the capacitors shown as C1 and C2. (3 Marks) 2µF 2 µF 2µF 2 µF 2 µF 2 µF C2 2µF 2 µF 50V Figure 1 ToInductance is often described as . (circle all that apply) The ability of a component to oppose a change in current The relationship between magnetism and current The ability of a component to store energy in an electromagnetic field The ability of a component to oppose a change in voltage