Hello, I really need help with PART A, PART B AND PART C. I am having trouble with physics and I don't understand the problem because the professor tells me I am getting the wrong answer. Is there a way that you can help me with PART A, PART B AND PART C and can you label which one is which thank you.

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter19: Capacitors
Section: Chapter Questions
Problem 2PA: You are an electrician working in an industrial plant. You discover that the problem with a certain...
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Hello, I really need help with PART A, PART B AND PART C. I am having trouble with physics and I don't understand the problem because the professor tells me I am getting the wrong answer. Is there a way that you can help me with PART A, PART B AND PART C and can you label which one is which thank you.

Problem 1: The switch in Fig.1 has been closed for a very long time.
What is the charge on the capacitor? The switch is opened at t = 0s.
At what time has the charge on the capacitor decreased to 10% of
its initial value?
Opens at t-Os
100V
HIE
6052
www
10523
4052 2 μF
a) The fact that the switch has been closed for a very long time
means that the capacitor in the scheme is fully charged, and it cre-
ates a physical barrier to the current. Therefore, the current through
the branch of the circuit with the 10 S2 resistor and the capacitor is
zero (if the capacitor was in the process of charging, there would be
a non-zero current in that branch carrying the charge to the capacitor). Find the current flowing through
the other two resistors.
FIG. 1: The scheme for Problem 1
b) Write down the Kirchhoff's loop law for the rightmost loop in the circuit (passing through 10 22 and
40 2 resistors, and the capacitor). When you move along the loop from the negative plate of the capacitor
to the positive plate, you gain the potential AVC, while moving from the positive to the negative plate you
lose the potential. The signs of the charges on the plates are not provided in the scheme, but you can
figure them out from the Kirchhoff's loop law itself. Make an initial guess, and if you get a negative value
for AVC, it means that the actual orientation of the plates is opposite to what you have guessed. From the
potential difference and the capacitance, compute the charge that is stored on the capacitor.
c) After the switch is opened, you are working with an RC circuit. What is the equivalent resistance
in this RC circuit? Compute the time at which the charge on the capacitor decreases to 10% of its initial
value. Answer: 2.3 × 10-4 s.
Transcribed Image Text:Problem 1: The switch in Fig.1 has been closed for a very long time. What is the charge on the capacitor? The switch is opened at t = 0s. At what time has the charge on the capacitor decreased to 10% of its initial value? Opens at t-Os 100V HIE 6052 www 10523 4052 2 μF a) The fact that the switch has been closed for a very long time means that the capacitor in the scheme is fully charged, and it cre- ates a physical barrier to the current. Therefore, the current through the branch of the circuit with the 10 S2 resistor and the capacitor is zero (if the capacitor was in the process of charging, there would be a non-zero current in that branch carrying the charge to the capacitor). Find the current flowing through the other two resistors. FIG. 1: The scheme for Problem 1 b) Write down the Kirchhoff's loop law for the rightmost loop in the circuit (passing through 10 22 and 40 2 resistors, and the capacitor). When you move along the loop from the negative plate of the capacitor to the positive plate, you gain the potential AVC, while moving from the positive to the negative plate you lose the potential. The signs of the charges on the plates are not provided in the scheme, but you can figure them out from the Kirchhoff's loop law itself. Make an initial guess, and if you get a negative value for AVC, it means that the actual orientation of the plates is opposite to what you have guessed. From the potential difference and the capacitance, compute the charge that is stored on the capacitor. c) After the switch is opened, you are working with an RC circuit. What is the equivalent resistance in this RC circuit? Compute the time at which the charge on the capacitor decreases to 10% of its initial value. Answer: 2.3 × 10-4 s.
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