Static Electricity by Friction between cotton cloth & plastic chair

Due to friction between cotton cloth and plastic chair gains electron so it becomes negatively charged and so the person who sit on the chair with the feet above the Earth also becomes negatively charged .........
We have made small cylinder using plastic syringe , top and bottom part is fitted with 5 rupee coin inside there is a thermocoal ball coated with aluminium foil
If we place it on a charged human body and if we touch the upper coin with bare feet on the floor that is earthing
The human body discharges via the thermocoal ball
First the thermocoal ball repelled by the body’s charge goes to the top it discharges to the earth and again it falls down again it charges and repelled , the cycle continue till whole body becomes neutral
Observe the Video!!