In the circuit shown, which of the following statements is correct?

Options

A. When S is open, charge on `C_(1) is 36muC`
B. When S is open, charge on `C_(2) is 36muC`
C. When S is closed, the charges on `C_(1)and C_(2)` do not change
D. When S is closed, charge on both `C_(1) and C_(2)` change

Answer

A, B, D

Explanation

When S is opem:
`C_(1)&C_(2)` are in series
:.`C_(eq)=(C_(1)C_(2))/(C_(1)+C_(2))=2muF`
charge (Q) `=18xx2=36muC`
when S is closed
`V_(1)=2xx3=6V`
`V_(2)=2xx6=12V`
`Q_(1)=C_(1)V_(1)=18muC ne 36muC`
`Q_(2)=C_(2)V_(2)=72muC ne 36muC`
:.charges on both `C_(1)& C_(2)` has changed.