Question

what's happened to charged capacitor and uncharged capacitor are connected

Answer 1

for example
when we connect a batteries of one fully charged and another with empty then there will be small amount of energy transfer as like for capacitaor also

Answer 2

Answer:

When a charged capacitor isconnected to an uncharged capacitor, the uncharged capacitor startscharging due to the potential difference. The charging process will continue till both capacitors acquire the same electric potential.