In plate `A` has `100 muC`
charge, while plate B has `60 muC` charge.
a. When both switches are open, then
`q_(1)="_____"`
`q_(2)="______"`
`q_(3)="______"`
`q_(4)="_______"`
b. When switch `S_(1)` is closed,
the
`q_(1)="_____"` , `q_(2)="______"`
`q_(3)="_______"` , `q_(4)="_____"`
c. When switch `S_(1)` is also closed, then
`q_(1)="______"`
`q_(2)="______"`
`q_(3)="______"` ltbrlt `q_(4)="_______"` .
.

Explanation

a. `q_(1)=80 muC, q_(2)=20 muC`
`q_(3)=-20 muC, q_(4)=80 muC`
b. `q_(1)=0, q_(2)=-60 muC`
`q_(3)=60 muC, q_(4)=0`
c. `q_(1)=q_(2)=q_(3)=q_(4)=0`.