CBSEGrade 12PhysicsElectrostatic Potential and Capacitance

Capacitor in Parallel: How does it affect the Total Capacitance?

Three capacitors of 10 μF, 20 μF, and 30 μF are connected in parallel across a 200 V supply. What is the total capacitance of the combination and how does it compare with the capacitance of each individual capacitor?

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📌 CONCEPT: When capacitors are connected in parallel, the total capacitance is the sum of individual capacitances, allowing the circuit to store more charge and behave as if it were a single capacitor with a larger capacitance.

📐 RULE / FORMULA: The formula for calculating total capacitance (C_total) when capacitors are connected in parallel is C_total = C_1 + C_2 + C_3 + ..., where C_1, C_2, and C_3 are the individual capacitances.

💡 WORKED EXAMPLE: If we have three capacitors of 10 μF, 20 μF, and 30 μF connected in parallel, the total capacitance is C_total = 10 μF + 20 μF + 30 μF = 60 μF. This means the combination behaves as a single capacitor with a capacitance of 60 μF.

⚠️ COMMON MISTAKE: Students often incorrectly assume that the total capacitance is the lowest value among the individual capacitors, which is not the case when capacitors are connected in parallel.

01 Nov 26