How Do Capacitors Behave in Different Configurations?

[CannonSLX]

Homework Statement

A capacitor has a capacitance of 5μF. If its fully charged from a 12V battery;
i) What will its charge on its plates at the end of the process
ii) The combined capacitance if the capacitor is connected in parallel with another 10μF capacitor
iii) The combined capacitance if the capacitor is connected in series with another 10μF capacitor

Homework Equations

i) C=Q/V
ii) C_total=C₁+C₂
iii) ii) 1/C_total=1/C₁+1/C₂

The Attempt at a Solution

i) Q=CV .:. Q=60A
ii) 15μF
iii) 1/C_total = 3/10 .:. C_total=10/3

 

[SammyS]

Homework Statement

A capacitor has a capacitance of 5μF. If its fully charged from a 12V battery;
i) What will its charge on its plates at the end of the process
ii) The combined capacitance if the capacitor is connected in parallel with another 10μF capacitor
iii) The combined capacitance if the capacitor is connected in series with another 10μF capacitor

Homework Equations

i) C=Q/V
ii) C_total=C₁+C₂
iii) ii) 1/C_total=1/C₁+1/C₂

The Attempt at a Solution

i) Q=CV .:. Q=60A
ii) 15μF
iii) 1/C_total = 3/10 .:. C_total=10/3

Your answer (i) for charge has the wrong units.

Your answer to (ii) is correct.

Your answer to (iii) has no units.

 

[CannonSLX]

Your answer (i) for charge has the wrong units.

Your answer to (ii) is correct.

Your answer to (iii) has no units.

Sorry, I meant C(Coulombs)
and is part iii) correct if I'd added uF ?

 

[SammyS]

Sorry, I meant C(Coulombs)
and is part iii) correct if I'd added uF ?

Yes. (10/3)μF is correct.

 

[rude man]

Sorry, I meant C(Coulombs)
and is part iii) correct if I'd added uF ?

part (i) is still wrong, even after changing A to C.