how can we understand the phenomenon of frictional electricity.???
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Answer:
Frictional Electricity
The substances which acquire charges on rubbing are said to be 'electrified' or charged. These terms are derived from the Greek word elektron, meaning amber. The electricity produced by friction is called frictional electricity. If the charges in a body do not move, then, the frictional electricity is also known as Static Electricity.
A charged glass rod is suspended by a silk thread, such that it swings horizontally. Now another charged glass rod is brought near the end of the suspended glass rod. It is found that the ends of the two rods repel each other as diagram 1. However, if a charged ebonite rod is brought near the end of the suspended rod, the two rods attract each other as diagram 2. The above experiment shows that like charges repel and unlike charges attract each other