Pick out the expression for energy stored in a capacitor from the following.(a) U = 2CV^2(b) U = \(\frac {1}{2}\) (Q^2C)(c) U = \(\frac {1}{2}\) (QV)(d) U = \(\frac {1}{2} (\frac {C}{V^2})\)This question was addressed to me in a national level competition.I'd like to ask this question from Energy Stored in a Capacitor in portion Electrostatic Potential and Capacitance of Physics – Class 12

Pick out the expression for energy stored in a capacitor from the foll

1.	Pick out the expression for energy stored in a capacitor from the following.(a) U = 2CV^2(b) U = \(\frac {1}{2}\) (Q^2C)(c) U = \(\frac {1}{2}\) (QV)(d) U = \(\frac {1}{2} (\frac {C}{V^2})\)This question was addressed to me in a national level competition.I'd like to ask this question from Energy Stored in a Capacitor in portion Electrostatic Potential and Capacitance of Physics – Class 12
Answer» Right option is (c) U = \(\frac {1}{2}\) (QV) To EXPLAIN: Work DONE in charging a capacitor gets stored in the capacitor in the form of its electric potential ENERGY and this is known as energy stored in a capacitor. The expression is given by: U = \(\frac {1}{2}\) (CV^2) = \(\frac {1}{2}\) (QV) = \(\frac {1}{2} (\frac {Q^2}{C})\) The unit is for this QUANTITY is joule.

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