Discuss the phenomena experienced due to electrostatics.
All of us have the experience of seeing a spark or hearing a crackle when we take off our synthetic clothes or sweater, particularly in dry weather, and also with ladies garments like a polyester saree. Another common example is the lightning that we see in the sky during thunderstorms. We also experience a sensation of an electric shock either while opening the door of a car or holding the iron bar of a bus after sliding from our seat.
The reason for these experiences is discharge of electric charges through our body due to rubbing of insulating surfaces.
Electrostatics deals with the study of forces, fields and potentials arising from static charges.
The minimum charge on an object is
What is earthing or grounding in household electrical circuit ?
A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to $X$-rays for a short period. Then
Discuss the historical observation of frictional electrics.
Write the activity to make simple electroscope.