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  • Electrical resistivity of a given metallic wire depends upon  (a) its length  (b) its thickness  (c) its shape  (d) nature of the material

Electrical resistivity of a given metallic wire depends upon 
(a) its length 
(b) its thickness 
(c) its shape 
(d) nature of the material

Answers (1)

Answer: (d)

Solution: 
Resistivity of material does not depend on length, thickness and shape of the material.
Electrical resistivity of a given metallic wire depends on number density of free electrons in the conductor,
which is the nature of the material.
p\alpha \frac{1}{n}
where, n = number of free electrons per unit volume.
Electrical resistivity also depends on the temperature of conductor.
Therefore, option (d) is correct.

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