Question: A parallel - plate capacitor with air between its plates is charged until a potential difference of V appears across it . Another capacitor, having

A parallel-plate capacitor with air between its plates is charged until a potential difference of V appears across it. Another capacitor, having hard rubber (dielectric constant =3) between its plates but otherwise identical, is also charged to the same potential difference. If the energy of the first capacitor is W, the energy of the second is 1/3 W
1/9 W
3 W
9 W

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