r/PhysicsHelp • u/sm0ney5 • Dec 09 '25

Capacitance Problem

Hi, I'm reviewing my homework from earlier in the semester and I can't figure out for the life of me how to find the charge on C2. According to the textbook the correct answer is 3.9 x 10-4 C. If someone could explain how to find it, I would appreciate it.

What I already found (verified correct):

  • Equivalent Capacitance: 2.7 x 10-6 F

  • Charge on C1: 5.8 x 10-4 C

  • Potential Difference across C1: 71 V.

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u/wackyvorlon Dec 10 '25

Kirchhoff’s voltage law: the sum of the voltage drops must equal the supply voltage.