Question

explain the factors affecting the resistance of a conductor​

Answer 1

Resistance :-

The obstruction offered to the flow of current by conductor is called resistance .

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When current flows through a conductor the conductor wire offers some obstruction to the flow of current are called resistance .

cause of resistance :-

When metal is form in atom lose electrons from its outer orbit of metal has a large number of vending electrons and an equal number of fixed positive ions the positive ions to not move while the electrons move alone really inside the metal .

These electrons are free electrons they move at random colliding almost themselves and with the positive ion in any direction . when the end of the metal wire connected to cell when a potential difference is applied across the end of the metal wire the electrons inside it experience of force in the direction from the end at negative potential towards the end to the positive potential of the conductor .

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The resistance of a conductor depends on :-

1. the number of collusion suffered by the electrons with the positive ions while moving from one end the another end .

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Answer 2

Factors affecting resistance of a conductor are:

1. Length of the conductor: The resistance of a conductor is directly proportional to its length, i.e. R ∝ l

2. Area of cross section: The resistance of a conductor is inversely proportional to its area of its cross section, i.e. R ∝ $\frac{1}{A}$

3. Temperature: The resistance of all pure metals are directly proportional to its temperature, i.e. R ∝ t

4. Nature of the material of the conductor: Metals like silver, copper and aluminium have very low resistance whereas  nichrome, constantan, etc. have higher resistance.