Three identical capacitors are connected in series across a potential source (battery). If a charge of Q flows into this combination of capacitors, how much charge does each capacitor carry?

a. Q
b.3Q
c. Q/9
d. Q/3

a) Q

Explanation:

If the capacitors are connected in series, across a potential source (battery) , the battery voltage is divided between the capacitors, as follows:

       

By definition, each voltage is related with the capacitance and the charge, as follows:

       

Now, due to the principle of conservation of charge, this can't neither accumulate nor dissapear at any point  in the circuit, so the charge must be the same for  each capacitor:

       

Iwould sure like to answer your question but i honestly just don’t know