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Three plates A, B, C each of area 50 cm^...

Three plates `A, B, C` each of area `50 cm^(2)` have separation `3 mm` between `A` and `B mm` between `B` and `C`. The energy stored when the plates area fully charged is

A

`1.6 xx10^(-9) J`

B

`2.1 xx10^(-9)J`

C

`5 xx10^(-9) J`

D

` 7xx10^(-9) J`

Text Solution

Verified by Experts

The correct Answer is:
B
`C_(eq)=(2Aepsilon_0)/d=(2xx50 xx10^(-4) xx8.85 xx10^(-12))/(3 xx10^(-3))`
`=295 xx10^(-11) F`
`U=1/2CV^2 `
`U=1/2 xx 2.95 xx10^(-11) xx(12)^2`
`U=2.12 xx10^(-9) J`
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