Question 6a)Describe, with the aid of suitable diagrams, three methods ofusing a parallel plate capacitor as a primary sensing element.The parallel plate capacitor of Figure Q6A is to be used as partof a sensing systemb)DielectricFigure Q6A.The cross sectional area of the plates is 4 x 10* m and thedistance between the plates is 0.2 mm. The dielectric has arelative permittivity of 2.5.Calculate the capacitance.ii) Find the capacitive reactance if the applied AC frequencyis 5 kHz.c)An applied vertical force couses the distance between the platesto reduce to 0.18 mm. Calculate the change in capacitance causedby the applied force.Briefly explain how the effect of changes in frequency could benegated if the sensor was connected to an AC bridge.d)(Question 6 continues overleaf)Page 9 of 14(Question 6 continues below)The coaxial capacitor of Figure Q58 is used as the basis of adisplacement sensor, with the displacement moving the centralcore to the left, hence reducing the shared length (L).e)Diplacement.Figure Q58.The capacitance is given by:In (b/a)The outer cylinder has a radius (b) of 18 mm and an 'overlappinglength (L) of 20 mm. The radius of the inner cylinder (a) is 16 mm.Findf)The capacitance at zero displacement.The new value of capacitance if the displacement of theinner core is 2 mm to the left, as shown in Figure Q5B.9)Capacitive sensors may be used as proximity sensors.Identify one advantage and one disadvantage of capacitiveproximity sensors.i)Suggest an alternative type of proximity sensor.

Given, A=4*10-4 m2d=0.2 mm=0.2*10-3mεr=2.5f=5 kHz

b) The parallel plate capacitor of Figure Q6A is to be used as part of a sensing system Dielectric - Figure Q6A. The cross sectional area of the plates is 4x 10* m and the distance between the plates is 0,2 mm. The dielectric has a relative permittivity of 2.5. ) Calculate the capacitance. Find the capacitive reactance if the applied AC trequency is 5 kHz.

b) The parallel plate capacitor of Figure Q6A is to be used as part of a sensing system Dielectric - Figure Q6A. The cross sectional area of the plates is 4x 10* m and the distance between the plates is 0,2 mm. The dielectric has a relative permittivity of 2.5. ) Calculate the capacitance. Find the capacitive reactance if the applied AC trequency is 5 kHz.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter19: Capacitors

Section: Chapter Questions

Problem 4RQ: 4. In what form is the energy of a capacitor stored?

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