Question

List the factor on which the resistance of conductor depends. Write the formula showing relation of resistance with these factors. ​

Answer 1

Resistance is the characteristic of a material which opposes the flow of electric current.

It depends on :  

i) Length of the conductor (l) : R is directly proportional to "l"  

ii) Area of cross -section (A) : R is inversely proportional to "A"  

iii) Nature of the material

iv) Temperature  

From i) and ii) , R is directly proportional to "l/A"  

=> R = rho * l/A

rho = Resistivity of a material

Resistivity depends only on the nature of the material

So, if the length is doubled of a conductor, the nature of the material will not be affected and hence, resistivity will not be changed.

Answer 2

The resistance of a current carrying conductor depends upon :
❤️ The length the wire. Resistance is directly proportional to the length of the current carrying wire. ( l ).
❤️ The Area of cross - section. Resistance is inversely proportional to the area of cross - section of a current carrying wire. ( A ).
❤️ Resistance depends upon the material of the wire. ( e )
❤️ Resistance also depends on the temperature of the current carrying wire. If the temperature is more then the resistance is also more.


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