What is the voltage across C2 in this circuit?

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AI Thread Summary
The discussion focuses on determining the voltage across capacitor C2 in a circuit. The user initially calculates the equivalent capacitance of C2 and C3 and finds the voltage across C2 to be 15V, while the expected answer is 20V. It is noted that C2 and C3 form a voltage divider across a 30V supply, which should result in equal voltage distribution due to their equal capacitance. The user may have overlooked the influence of C1 or initial conditions that could affect the calculations. The correct approach involves recognizing the voltage division principle in capacitive circuits.
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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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