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A2 2 Fields, Capacitors, Particles and Astronomy

Quick questions on Capacitors: capacitance, energy stored and exponential discharge - CCEA A-Level Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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A 200 μF200\ \mu\text{F} capacitor is charged to 12 V12\ \text{V}. Find the energy stored. [2 marks]
What is q2?
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A 100 μF100\ \mu\text{F} capacitor discharges through a 50 kΩ50\ \text{k}\Omega resistor. Find the time constant. [2 marks]
What is q3?
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A capacitor discharges with a time constant of 4.0 s4.0\ \text{s}. What fraction of the initial charge remains after 8.0 s8.0\ \text{s}? [2 marks]

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