Electrolytic Capacitors – Rankers Physics

Combination of Capacitors: Practice Problem & Solution

Assertion (A): Electrolytic capacitors have larger capacities. Reason (R): Electrolytic capacitors have a positive and a negative terminal.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution Explained:

To solve this problem, we apply the core principles of Combination of Capacitors. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true; electrolytic capacitors offer high capacitance due to their very thin dielectric layer and large effective plate area. Reason (R) is also true, as all capacitors have two terminals. However, the presence of terminals doesn't explain why they have *larger* capacities, so (R) is not the correct explanation for (A).

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Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Two capacitors of capacitances \( C_1 \) and \( C_2 \) are connected in series across \( 200\text{V} \) power supply. The potential drop across \( C_1 \) is \( 120\text{V} \). A capacitor of capacitance \( 2\ \mu\text{F} \) is connected in parallel with \( C_1 \) and the potential drop across \( C_2 \) becomes \( 160\text{V} \). What are the values of \( C_1 \) and \( C_2 \) in \( \mu\text{F} \)?
2. A capacitor of capacity \(C_0\) is connected to a battery of emf \(V_0\). When steady state is attained a dielectric slab of dielectric constant (K) is slowly introduced in the capacitor. Mark the Correct statement(s), in final steady state :
3. Assertion (A): If temperature is increased, the dielectric constant of a polar dielectric decreases whereas that of a non-polar dielectric does not change significantly. Reason (R): The magnitude of dipole moment of individual polar molecule decreases significantly with increase in temperature.  
4. A parallel plate air capacitor of capacitance $C$ is connected to a cell of emf $V$ and then disconnected from it. A dielectric slab of dielectric constant $K$, which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect? (2015)
5. A parallel plate capacitor is made by stacking \( n \) similar metallic plates equally spaced from one another. The capacitance of the capacitor formed by any two neighbouring plates is \( C \). The total capacitance of the combination will be