In the given figure, what is the Flux enclosed by A and B?

Explanation

`phi_(A)=I/(epsilon_(0))[(200-50)nC]`
`=(1/(8.854xx10^(-12)))(150xx10^(-9)C)`
`=0.0029xx150xx10^(3)`
`phi=5.64xx10^(3)Vm`
`:.phi=5.64xx10^(3)Vm`
`phi_(B)=1/(8.854xx10^(-12))(-50xx10^(-9))Vm`
`=-5.647xx10^(3)Vm`