What happens to the resistance of a conductor when
(i) the length of the conductor is increased?
(ii) thickness of the conductor is decreased?
(iii) temperature of the conductor is increased?
Answers
Answer:
1)when you have longer length of wire, the current has to travel more distance, more the distance higher the number of obstacles it faces through its path.
2) The resistance of the wire will decrease if we made the conductor thicker because R (resistance) = p (rho). l (length) / A (area of cross-section or thickness of wire).Area is directly proportional to the radius of the wire. So as you can see if area of cross-section ( or thickness) of wire increases, resistance decreases and more current flows through it.
3) If you increase the temperature of the conductor the number of phonons will increase, thus resulting in more collisions. The increase of the number or probability of collisions results in the increase of resistance of the conductor.
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