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1. A capacitor is charged with 6 microcoulomb, and the potental of the
capacitor is measured and found to be 3 volt. What is its capacitance?
2. This same capacitor is now carefully discharged completely. What is its
capacitance now?
You'd be surprised how many students will answer "zero" to part 2. What is
the flaw in their thinking? What is incomplete or incorrect about their
conceptual understanding of capacitance.
-- Donald