A capacitor consists of_________

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Examoogle · Accepted Answer

Two conductors

Explanation: A capacitor is a passive two-terminal electronic component that stores electrical energy in an electric field. It essentially consists of two conductors (plates) separated by an insulating material called a dielectric.

Working Principle: When a voltage source is connected to the two conductors, opposite electrical charges accumulate on the plates. The electric field created within the dielectric between the plates stores energy, and the amount of charge stored is proportional to the voltage applied across the terminals.

Key Formulas: $C = \epsilon \frac{A}{d}$ — capacitance formula where A is area and d is plate separation; $Q = CV$ — fundamental relation between charge, capacitance, and voltage

Key Points: The plates are made of conductive materials (like aluminum or copper).; The dielectric material can be air, ceramic, paper, or plastic.; Capacitors block DC current and allow AC current to pass.; The unit of capacitance is the Farad (F).

Advantages: Stores energy in electric fields; Essential for filtering and signal coupling

Disadvantages: Limited energy storage compared to batteries; Leakage current may occur over time

Applications: Power supply filtering; Timing circuits and oscillators

Additional Info: Dielectrics are insulators by definition; therefore, calling them 'two dielectrics' is incorrect as the charge needs to be stored on conductive surfaces.. Semiconductors have properties between conductors and insulators and are not the primary requirement for a standard capacitor.

Answer: A is correct — A capacitor is fundamentally formed by two conductive plates separated by an insulating medium known as a dielectric.

Exam Tip: Always remember that a capacitor acts as an open circuit in steady-state DC analysis after it is fully charged.

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