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Charge, Current, Potential Difference

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In the attached circuit diagram:

1) Find the magnitude of the charge in the upper branch.

2) Find the magnitude of the current in the middle branch.

3) Find the magnitude of the current in the lower branch.

4) What is the potential difference V_ab of point a relative to point b?

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Scan of handwritten solution, that makes use of KVL (Kirchoff's law).

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