Question

)
d) 75.
Two copper wires of length 1 and 21 have radii r and 2r respectively.
The ratio of their specific resistances is
ta) 1:2
(b) 2:1
(c) 1:1
(d) 1:3.​

Answer 1

Answer:

c) 1:1

Explanation:

Specific resistance is a property of material and unlike resistance it does not depend upon the area and length of the wire.

R=ρ l / A

R is the resistance which depends upon length l and area A but specific resistance ρ does not depend upon any other parameters expect for the material it is made of. So all the wires made from copper will have same specific resistance regardless of their length and area