Charge on capacitor C1, q1‌=C1V1 ‌=9×10−5C C2‌=20µF=2×10−5F when uncharged capacitor C2 is connected with charged capacitor C1, then charges will flow from capacitor C1 to C2 till both gain the same potential i.e common potential. Common potential, V=‌
‌ total charge ‌
‌ total capacitance ‌
‌=‌
q1
C1+C2
=‌
9×10−5
10−5+2×10−5
‌=‌
9×10−5
3×10−5
=3V Charge on capacitor C2,q2=C2V =2×10−5×3=6×10−5C