A capacitor is charged by a battery and then disconnected.How are the capacitance, potential difference and stored energy related to the capacitor affected if
The plates are connected by a metallic wire?

Explanation

Capacitance of a parallel plate capacitor,
`C= (k in_0alpha)/(d)`
If the plates of the charged capacitor are connected by a metallic wire, the capacitor will be discharged immediately. It will not act as a capacitor any more. The potential difference between the plates of the capacitor as well as the energy stored will be zero.