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A capacitor of capacitance 10 microfarad...

A capacitor of capacitance 10 microfarad is charged to potential of 1000 V
1. Find energy stored in the capacitor
2. If a slab of dielectric constant K=5 , is introduced between the plates of the capacitor , such that is fully fills the space between the plates, then the new capacitance of the capacitor is :

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