Question

C C C a C2 C2 C b HE C d HE C C

In the figure (Figure 1), each capacitance C1C1 is 6.9 μFμF , and each capacitance C2C2 is 4.6 μFμF .

A:

Compute the equivalent capacitance of the network between points a and b.

Express your answer using two significant figures.

Ceq =

???

B:

Compute the charge on the capacitor C1C1 nearest to a when VabVab = 430 VV .

Express your answer using two significant figures.

Qa1 = ????

C:

Compute the charge on the capacitor C1C1 nearest to b when VabVab = 430 VV .

Qb1 =???

D:

Compute the charge on the capacitor C2C2 nearest to a and b when VabVab = 430 VV .

Express your answer using two significant figures.

Q2 =???

E:

With 430 VV across a and b, compute VcdVcd.

Express your answer using two significant figures.

Vcd =????

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Answer #1

solving the circuit from right to left

last 3 capacitors ar ein series

resultant of these capacitors is =  6.9 μF/3 = 2.3 μF

this is parallel with c2 = 2.3+4.6 = 6.9 μF

again c1.6.9μF and c1 are in series = 6.9/3 = 2.3 μF

now 2.3μF and c2 are in parallel = 2.3+4.6 = 6.9μF

near a and b

c tot = 6.9/3 = 2.3 μF

total charge q tot = 2.3*10^-6*430 = 0.989*10^-3 C

b)

the charge on the capacitor C1 nearest to a = 0.989*10^-3 C

because in a sereis connection change is same on the capacitor

c) the charge on the capacitor C1 nearest to b = 0.989*10^-3 C

d) charge on c2 between a and b  

voltage across c2 = 0.989*10^-3/6.9*10^-6 = 143.3 V

charge on c2 between a and b = 4.6*10^-6*143.3 = 0.659*10^-3 C

e) vcd = 47.77 V

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