Figure given below shows two identical parallel plate capacitors connected to a battery with swit...

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Figure given below shows two identical parallel plate capacitors connected to a battery with switch S closed. The switch is now opened and the free space between the plates of capacitors is filled with a dielectric of dielectric constant 3 . What will be the ratio of total electrostatic energy stored in both capacitors before and after the introduction of the dielectric
[IIT 1983]
(a) 3: 1
(b) 5: 1 (c) 3: 5
(d) 5: 3

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