A charged air capacitor has stored energy U. What will be the energy stored when air is replaced by a dielectric of dielectric constant K, charge Q remain the same

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  • 2
as charge remains same,apply U=(0.5)Q2/C
now , C=​  
(ϵ*area )/d,
also, ϵ=ϵ0k,
so new C`=kC,
hence U`=(0.5)Q2/C`
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