## Friday, May 8, 2009

### 1. E L E C T R O S T A T I C S .3M ANSWERS

1. E L E C T R O S T A T I C S .

1. WHAT IS ELECTROSTATICS?
Electrostatics is the branch of Physics, which deals with static electric charges or charges at rest.
2. WHAT IS FRICTIONAL ELECTRICITY?
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.
3. STATE THE APPLICATIONS OF PROPERTIES OF ATTRACTION & REPULSION OF CHARGES?
The property of attraction and repulsion between charged bodies have many applications such as electrostatic paint spraying, powder coating, fly−ash collection in chimneys, ink−jet printing and photostat copying (Xerox) etc.
4. WHAT ARE CONDUCTORS & INSULATORS? GIVE EXAMPLES
Bodies which allow the charges to pass through are called conductors. e.g. metals, human body, Earth etc.
Bodies which do not allow the charges to pass through are called insulators. e.g. glass, mica, ebonite, plastic
5. WRITE NOTE ON QUANTISATION OF ELECTRIC CHARGE
Quantisation of electric charge The fundamental unit of electric charge (e) is the charge carried by the electron and its unit is coulomb. e has the magnitude 1.6 × 10−19 C.
In nature, the electric charge of any system is always an integral multiple of the least amount of charge. It means that the quantity can take only one of the discrete set of values. The charge,

q = ne where n is an integer.