Example 1 · level 1
Capacitors of 4 μF and 12 μF are connected in series. Find the equivalent capacitance in μF.
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- C = 48 ÷ 16 = 3 μF.
Answer: 3
CLASS 11–12 PHYSICS · ELECTROSTATIC POTENTIAL AND CAPACITANCE
Capacitors: combinations and stored energy
Parallel: C = C₁ + C₂. Series: 1/C = 1/C₁ + 1/C₂. Charge Q = CV; energy U = ½CV².
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Worked examples
Example 2 · level 2
A 1 μF capacitor is charged to 12 V. Find the energy stored in it, in μJ (microjoules).
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- U = ½ × 1 × 144 = 72 μJ.
Answer: 72
Example 3 · level 3
Capacitors of 6 μF and 12 μF are connected in series across a 10 V battery. Find the charge on each capacitor in μC (correct to 2 decimal places).
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- C = 4 μF.
- Q = 4 × 10 = 40 μC on each.
Answer: 40