To solve the problem below, you must write clear and convincing justification fo

Question

To solve the problem below, you must write clear and convincing justification for accepting one of the possible answer choices as best or most appropriate and for rejecting each of the other choices as less appropriate. Your reasons for rejecting choices are just as important as your reasons for choosing the best answer.

Which of the following section would most significantly reduce the impedance to current flow by a capacitor in an alternating- current circuit?
a. Decreasing the frequency of the alternating current.
b. Increasing the area of the capacitor plates.
c. Placing another identical capacitor in series with the first one in the circuit.
d. Increasing the resistance in the circuit.
e. Taking a dielectric out of the capacitor.

Explanation / Answer

a)

Capacitive reactance

Xc=1/2pifC

if frequency is reduced ,Impedance Increases ,from above equation.

So No to the answer

2.

Capacitance

C=KeoA/d

if Area Increases ,then Capacitance Increases

Xc=1/2pifC

so from above equation with Capacitance increase ,Impedance decreases

so Yes it is the answer

3.

If another Capacitor is added in series ,then overall capacitance decreases

1/C =1/C1+1/C2

so Impedance increases

So No to the answer

4.

If resistance is increased ,Impedance increases due to below equation

Z=sqrt[R2+Xc2]

so No to the answer

5.

if Dielectric is removed ,capacitance decreases by a factor of K

C=KeoA/d =>with dielectric

C'=eoA/d=C/K ==>without dielectric.

So Impedance Increases

So No to the answer

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