Energy stored in a capacitor is given by:
Correct answer: D. All of these
- A. QV/2
- B. CV²/2
- C. Q²/2C
- D. All of these
Explanation
In a capacitor, charge +Q and -Q is stored on one plate each. The potential difference between the plates is V, and the average potential difference during the charging process is V/2. Thus, the energy stored in a capacitor is:U = QV/2 ............(1)putting Q = CV in (1):U = CV2/2putting V = Q/C in (1)U = Q2/2C
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About Electrostatics
Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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