HW 2 material

Question 1

Are these resistors in series or parallel?

Answer 1

Series

Question 2

How do you find the current through this circuit?

Answer 2

1) Use loop rule and note that VR=IZR and Vc=IZc
2) I = Vs / ZR + Zc
3) Solve for I

Question 3

What is |I|?

Answer 3

Question 4

What is w_0?

Answer 4

w_0 = 1/RC

Question 5

For Vc = I*Zc, what is Zc?

Answer 5

Zc = 1/wC

Question 6

If Vc = VR, and w = w_0, how do you find Vc and VR?

Answer 6

1) Use the |I| equation to find I
2) Solve VR = I*R = Vc

Question 7

How to find how much charge does the battery deliver?

Answer 7

1) Find total capacitance
2) Use Q = C*Vc

Question 8

How to find the charge on each capacitor?

Answer 8

Since the capacitors are connected directly to each other, so the space between them is electrically neutral, meaning Q1=Q2=Q

Question 9

Voltage of each capacitor?

Answer 9

V1 = Q1/C1, and V2 = Q2/C2

Question 10

If switch A was closed so that C1 is fully charged to 1.2V, then it was opened and switch B was closed, how do you find Q2?

Answer 10

1) find Q (Q=C1Vc)
2) Since C2 = 2C1, distribute Q between C1 and C2 accordingly