Solving Capacitor Problem - Find q1

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The discussion centers on a capacitor problem involving capacitors C1 and C2 in parallel, combined in series with C3. The user is attempting to calculate the charge q1 on capacitor C1 using the formula q1 = V_ab*((C3*C1*C2)/(C3 + C2 + C1), which is identified as incorrect. Respondents point out that the equivalent capacitance has been calculated incorrectly, leading to a dimensionally incorrect expression. Clarification on the correct approach to find q1 is sought. Accurate calculations of equivalent capacitance are essential for solving capacitor problems effectively.
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Capacitor Problem!

Hi I have a problem where the applied potential is V_ab, Capacitors C1 and C2 are in parallel, and the combination is in series with C3. Now I'm trying to find the charge q1 on the capacitor C1. I thought that q1 = V_ab*((C3*C1*C2)/(C3 + C2+ C1)), but it is wrong. Can someone help me out? Thank-you so much!
 
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In very first look it appears that you have calculated equivalent capacitance wrongly because the expression is dimensionally(units) incorrect.
 

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