Question

Write the factors affecting resistance of a conducting wire. Derive the s.I. Unit of electrical resistivity. Define the electrical conductivity.

Answer 1

Answer:

The factors affects the resistance of a conducting wire are -

1. Length of the wire.

2. cross section area of the wire.

3. Resistivity of the wire.

SI unit of resistivity:

The S.I. unit of resistivity can be calculated as- show the 2 figure given above.

Electrical conductivity:

Electrical conductivity may be defined as the reciprocal of resistivity.

Explanation:

According to the physical interpretation of resistance we know that-

1. R directly proportional to the resistivity of the wire.
2. R directly proportional to the length of the wire.
3. R inversely proportional to the cross-sectional area of the wire.