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. WRITE NOTE ON CONSERVTION OF ELECTRIC CHARGES?
Electric charges can neither be created nor destroyed. According
to the law of conservation of electric charge, the total charge in an
isolated system always remains constant. For example, Uranium (92U238) can decay by emitting an alpha particle (2He4 nucleus) and transforming to
thorium (90Th234).
92U238 −−−−> 90Th234 + 2He4
Total charge before decay = +92e, total charge after decay = 90e + 2e.
Hence, the total charge is conserved.
2. STATE COULOMB’S LAW IN ELECTROSTATICS
The force between two charged bodies was studied by Coulomb in
1785. Coulomb’s law states that the force of attraction or repulsion
between two point charges is directly proportional to the product of the
charges and inversely proportional to the square of the distance between them F= K q1 q2 /r2

3. DEFINE ONE COULOMB.
One Coulomb is defined as the quantity of charge, which when
placed at a distance of 1 metre in air or vacuum from an equal and
similar charge, experiences a repulsive force of 9 × 109 N.

4. DEFINE ELECTRIC FIELD
Electric field due to a charge is the space around the test chargein which it experiences a force. The presence of an electric field
around a charge cannot be detected unless another charge is brought
towards it.
5. DEFINE ELECTRIC FIELD INTENSITY
Electric field at a point is measured in terms of electric field
intensity. Electric field intensity at a point, in an electric field is defined
as the force experienced by a unit positive charge kept at that point.
It is a vector quantity. E= F/q. The unit of electric field intensity
is N C−1.

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