## woleraymond 3 years ago In figure below if a charge of 4uc flows from the 6V battery to plate P of the 1 uF capacitor. what charge flow from a - Q to R b - S to the battery c - What is the pd across C1 and C2 d - What is capacitance of C2 e - What is the single capacitor which is equivalent to C1 and C2 in series and what charge would it store?

1. woleraymond

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2. Algebraic!

a. 4uC b. 4uC c. 6V d. $Q = C _{eq}V$ $\frac{ 1 }{ C _{eq}} = \frac{ 1 }{ C _{1}}+\frac{ 1 }{ C _{2}}$ $Q = ( \frac{ 1 }{ C _{1}}+\frac{ 1 }{ C _{2}})^{-1}V$

3. Algebraic!

make sense?

4. masumanwar

use conservation of charge

5. woleraymond

@Algebraic! please can you explain how u derived a,b,c

6. Algebraic!

if +4uC is on the plate at P then -4uC will be on the plate at Q meaning +4uC flowed to the plate at R meaning that there's - 4 uC at the plate at S meaning +4uC flowed to the terminal of the battery. For c. ) I did the total voltage drop, which must be 6V, you could also do the drop per capacitor, and then find the capacitance of c2 from that. I didn't do it that way, I combined the solution to d and e into one part instead.