The total energy stored in the condensery system shown in the figure will be

Options

A. `8 muJ`
B. `16 muJ`
C. `2 mu J`
D. `4 muJ`

Answer

A

Explanation

`3 muF and 6 muF` are in series .
`therefore (3xx6)/((3+6)) = 2 muF`
This is in parallel with `2 muF `
`therefore` Total capacitance in the circuity is `4 muF`
Q= CV
Energy ` = (1)/(2) QV`
` = (1//2)V^(2)C = (1//2) xx 2^(2) xx 4xx 10^(-6)J = 8 muJ`