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Two capacitor C1 with capacitance 2C and...

Two capacitor `C_1` with capacitance 2C and `C_2` with capacitance C are connected in parallel. They are changed and then the batter is removed. If a material of dielectric constant K is inserted in `C_2`. Find final potential across them.

A

`KV`

B

`(3V)/(K+2)`

C

`V/K`

D

`3/(KV)`

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