electrostatics-capacitors(physics homework help)

electrostatics-capacitors(physics homework help)

State
(i) Coulombs law of electrostatics
(ii) Two types of capacitors.
(iii)Two uses of dielectrics.
(b) A capacitor of plate area 250 has a dielectric 1.5mm thick. If the dielectric constant is three and the
capacitor is connected across 1500 V direct current, determine
(i) the capacitance of the capacitor.
(ii) electric flux density in the dielectric.
(iii) electric field strength in the dielectric.
20 Ω 80V
35 Ω
30 Ω
3
(c) An 120µF capacitor is charged to a potential of 300V.The terminals of the charged capacitor are then
disconnected and connected to 80µF capacitor, determine
(i) the final p.d across each of the capacitors.
(ii) the change in energy in the two systems i.e original and final system.

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