Warm up set 5 Question Answer: (a) Q/2, Q/2 (b) Q, -Q (c) Q/2, -Q/2

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Presentation transcript:

Warm up set 5 Question Answer: (a) Q/2, Q/2 (b) Q, -Q (c) Q/2, -Q/2 1. HRW6 26.TB.03. [119752] A capacitor C "has a charge Q". The actual charges on its plates are: (a) Q/2, Q/2 (b) Q, -Q (c) Q/2, -Q/2 (d) Q, 0 (e) Q, Q Answer: (b) Q and -Q The plates of a capacitor always have equal and opposite charges. The characterization of a capacitor as “having charge Q” is simply a convention for a capacitor with plates charged Q and -Q.

Question Answer: (a) increases the potential difference 2. HRW6 26.TB.13. [119762] Pulling the plates of an isolated charged capacitor apart: (a) increases the potential difference (b) increases the capacitance (c) does not affect the capacitance (d) decreases the potential difference (e) does not affect the potential difference Answer: Increases the potential difference The capacitance of a plate capacitor is: Thus the distance and the potential are directly related, and if the distance increases, so must the potential difference across the plates.

Question 3. HRW6 26.TB.25. [119774] Let Q denote charge, V denote potential difference and U denote stored energy. Of these quantities, capacitors in series must have the same: (a) Q only (b) Q and U only (c) U only (d) V and U only (e) V only Answer: Q only