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Solution


Q.

On which of the given factors, resistance does not depend:
1 length of conductor  
2 area of cross-section  
3 temperature  
4 density  

Ans.

 (4)

The resistance of a wire can be expressed as: 

R=ρLA

Where,
A = Area of cross-section of the conductor
L = Length of the conductor
ρ = Resistivity

From the above relation, we can see that resistance of a wire is directly proportional to its length and inversely proportional to the area of cross-section. Hence, resistance does not depend on the density.