Trying to find the right answer to this..

Electrostatic Potential and Capacitance

Question

Answer the following:
A man fixes outside his house one evening a two metre high insulating slab carrying on its top a large aluminium sheet of area 1 m². Will he get an electric shock if he touches the metal sheet next morning?

Answer

Yes, the man will get an electric shock. Because, aluminium sheet is gradually charged up by the steady discharging current of the atmosphere. Eventually, the voltage of the aluminium sheet is raised to an extent, depending on the capacitance of the capacitor (formed by the aluminium sheet, insulating slab and the ground.)