## 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 .3M ANSWERS,
1. DEFINE ELECTRIC POTENTIAL ENERGY?
Electric potential energy of an electric dipole in an electric field.
Electric potential energy of an electric dipole in an
electrostatic field is the work done in rotating the dipole to
the desired position in the field.
2. DESCRIBE THE WORKING OF MICROWAVE OVEN.
It is used to cook the food in a short time. When the oven is
operated, the microwaves are generated, which in turn produce a non−
uniform oscillating electric field. The water molecules in the food which
are the electric dipoles are excited by an oscillating torque. Hence few
bonds in the water molecules are broken, and heat energy is produced.
This is used to cook food.
3. DEFINE POTENTIAL DIFFERENCE.
The potential difference between two points in an electric field is
defined as the amount of work done in moving a unit positive charge
from one point to the other against the electric force.
The unit of potential difference is volt
4. DEFINE THE UNIT OF POTENTIAL DIFFERENCE.
The potential difference between two points is 1 volt if 1 joule of work is done in moving 1 Coulomb of charge from one point to another against the electric force.
5. DEFINE ELECTRIC POTENTIAL.
The electric potential in an electric field at a point is defined as the amount of work done in moving a unit positive charge from infinity to that point against the electric forces.