Physics > AQA QUESTION and MARK SCHEMES > REVISION SCIENCE TO EXCEL IN A-LEVEL PHYSICS A-levelPHYSICS7408/2Paper 2 (All)
REVISION SCIENCE TO EXCEL IN A-LEVEL PHYSICS A-levelPHYSICS7408/2Paper 2
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A capacitor of capacitance 63 pF is made from two parallel metal plates separated by an air gap. The capacitor is charged so that it stores a charge of 7.6 × 10−10 C; it is then isolated. A sheet ... of mica of dielectric constant 6.0 is inserted between the plates so that it completely fills the space between them. The mica does not discharge the capacitor and does not change the separation of the plates. Explain what is meant by a dielectric constant of 6.0 Calculate the difference between the initial energy stored by the capacitor and the energy stored when the mica has been fully inserted. Mica is made up of polar molecules. As the mica is inserted, the capacitance of the capacitor changes. Explain how the polar molecules cause this change in capacitance. [Show More]
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