NEET 2017 Physics question

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

(1)Increases by a factor of 4
(2)Decreases by a factor of 2Correct
(3)Remains the same
(4)Increases by a factor of 2

Answer: (2)

Solution

Let the capacitor have capacitance and be charged to : charge , initial energy . After connecting an identical uncharged capacitor in parallel (battery removed) the charge is shared equally, the common

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Question ID VK-092031