Question

What would be the effect on the resistance of a metal wire by :
(a) increasing its length (b) increasing its diameter (c) increasing its temperature

Answer 1

Answer:

The effect on the resistance of a metal wire of resistance through resistivity,

 R = ρl/A.

(a) From the above equation, it is clear that resistance is directly proportional to the length. So, if the length is increased the resistance of the metal wire will increase too.

(b) When you increase the diameter of the metal wire, the area of cross-section increases resulting into decreasing the resistance of the metal wire.

(c) The resistance of a metal wire increases when the temperature is increased as the resistance depends on the nature of the material

Answer 2

Answer :

The effect on the resistance of a metal wire by :

• The increase in the length of the metal wire will increase the the resistance of the metal wire because length of the metal wire is directly proportional to the resistance.

• The increase in the diameter of the metal wire will reduce the the resistance of the metal wire because diameter of the metal wire is inversely proportional to the resistance.

• The increase in the temperature of the metal wire will increase the resistance of the metal wire because temperature is directly proportional to the resistance.

Resistance -

Resistance is the opposition opposition of flow of electrons.

The system international (SI) unit of resistance is ohm.

The resistance of a conductor mostly depends on its length, area of cross section and the nature of its material.