The energy stored in a capacitor is given by:
Correct answer: B. U= CV2/2
- A. U = ½ QV2
- B. U= CV2/2
- C. U = ½ QC
- D. U = Q/2v
Explanation
Energy stored in a capacitor is electrical potential energy, and it is thus related to the charge Q and voltage V on the capacitor. The energy stored in a capacitor can be expressed in three ways:Ecap = QV/2 = CV2/2 = 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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