Capacitance and Dielectrics

Physics · Chapter 4 · Units 1-2: Electrostatics and Current Electricity

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Your path through this chapter

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Visual lesson Beta
1. Part 1: Conductors, capacitance and combinations15 slides
2. Part 2: Energy and dielectrics15 slides
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Notes Beta
6 sections with key terms, formulas and exam tips.
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Flashcards Beta
30 cards for quick recall of key terms and facts.
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Practice
67 board-style questions with instant checks: Numerical 22, Multiple choice 16, Short answer 15, Assertion and reason 5.
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Chapter test Free
Short and long chapter tests in board pattern, with results and analysis.
- Chapter test (long) — Capacitance and Dielectrics · 40 marks · 100 min
- Chapter test (short) — Capacitance and Dielectrics · 20 marks · 50 min
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Conductors in electrostatics; free and bound charges; capacitance of a conductor C = Q/V
Parallel-plate capacitor: C = eps0 A / d
Capacitors in series and in parallel
Energy stored in a capacitor U = (1/2)CV^2 = (1/2)QV = Q^2/(2C); energy density
Dielectrics: polarisation (qualitative); dielectric constant K = C'/C = eps_r; effect of a dielectric with battery disconnected and connected
Capacitor partially filled with a dielectric slab: C' = eps0 A / (d - t + t/K)