Capacitors and Dielectrics. 1) Describe polarization of a dielectric's molecules and how that results in charge accumula

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Capacitors And Dielectrics 1 Describe Polarization Of A Dielectric S Molecules And How That Results In Charge Accumula 1 (76.58 KiB) Viewed 13 times

Capacitors and Dielectrics. 1) Describe polarization of a dielectric's molecules and how that results in charge accumulation. 2) Define the displacement current. Are charges physically flowing through the dielectric? 3) What is the result of increasing thickness of a dielectric (increasing d in the capacitor equation) while keeping the amount of charge on each plate the same? Think in terms of the capacitance and the voltage measured across the capacitor. 4) Given C == and the units of & are F/m, determine the equivalent units of the Farad (I.E. in terms of other available units). 5) Draw the energy band diagram of a capacitor made of two aluminum plates with a glass dielectric. The capacitor should have zero applied voltage. 6) Redraw the diagram in (5) with a small positive voltage on the right-hand side (no voltage or OV on the left-hand side). 7) What happens to the relative "thickness", or distance an electron must travel in a straight line across the dielectric, as you increase the voltage? 8) Remembering quantum tunneling from Chapter 3, what is happening to the probability of a tunneling event as the "thickness" of the barrier representing the dielectric decreases? 9) Based on your answer in (7), can you apply an arbitrarily large field or voltage across a dielectric? What is the name for this limitation and what is its value for Air and Glass (SiO2)? 10) Assuming Ic = C² dv dt find the displacement current for Vc = e-wt + 4 V and Vc = sin(wt) + 4 V. 11) From your answer in (10), does the 4V 'DC' or steady state voltage impact the value of the displacement current, Ic.