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Question: Answered & Verified by Expert
The mean electric energy density between the plates of a charged capacitor is (here $q=$ charge on the capacitor and $A=$ area of the capacitor plate)
PhysicsCapacitanceJEE Main
Options:
  • A $\frac{q^2}{2 \varepsilon_0 A^2}$
  • B $\frac{q}{2 s_0 A^2}$
  • C $\frac{q^2}{2 \varepsilon_0 A}$
  • D None of the above
Solution:
1753 Upvotes Verified Answer
The correct answer is: $\frac{q^2}{2 \varepsilon_0 A^2}$
Energy density
$=\frac{1}{2} \varepsilon_0 E^2=\frac{1}{2} \varepsilon_0\left(\frac{\sigma}{\varepsilon_0}\right)^2=\frac{\sigma^2}{2 \varepsilon_0}=\frac{q^2}{2 \varepsilon_0 A^2}$

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