A air-filled capacitor is connected to a source and allowed to charge fully.

PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

4.7\,\mu\text{F}

air-filled capacitor is connected to a

12\,\text{V}

source and allowed to charge fully. (i) Calculate the charge stored on the capacitor. (ii) The source voltage is now increased steadily to

18\,\text{V}

while the capacitor remains connected. Determine the additional charge that flows onto the plates during this increase. (iii) If instead the source voltage had been reduced from

12\,\text{V}

6\,\text{V}

, by what percentage would the charge originally stored have decreased?

Related theory

Capacitance
Energy stored in capacitors
Capacitors and capacitance
Electrostatic Potential and Capacitance

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