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Consider a para llel plate capacitor of area A (of each plate) and separation 'd' between the plates. If E is the electric field and  0 is the permittivity of free space between the plates, then potential energy stored in the capacitor is : -

1. Ad E 2 1 2 0 
2. Ad E 4 3 2 0 
3. Ad E 4 1 2 0 
4.  0 E 2 Ad

Correct answer: Ad E 2 1 2 0 

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