What is the voltage across C2 in this circuit?

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SUMMARY

The voltage across capacitor C2 in the given circuit is determined to be 20V, despite the initial calculation yielding 15V. The user correctly identified that capacitors C2 and C3 form a voltage divider across a 30V supply. Since C2 and C3 have equal capacitance, they equally share the total voltage, resulting in 20V across each capacitor. The initial conditions, such as charges on C1, were not necessary for this calculation.

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Homework Statement


upload_2015-2-3_22-46-50.png


Find the pd accros C2

Homework Equations


Q=CV

The Attempt at a Solution


i find C23 = (C2C3)/ (C2 + C3)
then find Q23 = V x C23
Q23 = Q2 = C2V2 => V2

i used this and got V2 = 15V , however the answer is 20V , and i even didnt use the data of C1 . am i wrong somewhere ?
 
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Your answer looks fine, unless there are some initial conditions (such as initial charges) that weren't specified. C2 and C3 form a voltage divider which is across the supply 30 V, and since they are of equal capacitance they must must divide the voltage... how?
 

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