In a parallel plate capacitor, the distance between the plates is d & potential difference across plates is V. Energy stored per unit volume between the plates of capacitor is :
Q22V2
12ϵ0V2d2
12V2ϵ0d2
12ϵ0V2d
A
12V2ϵ0d2
B
Q22V2
C
12ϵ0V2d2
D
12ϵ0V2d
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Solution
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Energy stored per unit volume U=12ϵ0E2=12ϵ0(V2d2)=12ϵ0V2d2(∴E=Vd)
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