Correct Answer - Option 4 : Copper
Resistivity: It is the electrical resistance(R) of a conductor of unit cross-sectional area(A) and unit length(L).
- Symbol: ρ (rho)
- Formula: ρ = RA/L
- Unit: ohm-metre
Resistivity values of some important materials are listed below
Order of resistivity value: metals < alloys < semiconductors < insulators.
|
Material
|
Resistivity ρ
(ohm m)
|
|
Silver
|
1.59
|
x10-8
|
|
Copper
|
1.68
|
x10-8
|
|
Copper, annealed
|
1.72
|
x10-8
|
|
Aluminium
|
2.65
|
x10-8
|
|
Tungsten
|
5.6
|
x10-8
|
|
Iron
|
9.71
|
x10-8
|
|
Platinum
|
10.6
|
x10-8
|
|
Manganin
|
48.2
|
x10-8
|
|
Lead
|
22
|
x10-8
|
|
Mercury
|
98
|
x10-8
|
|
Nichrome
(Ni, Fe, Cr alloy)
|
100
|
x10-8
|
|
Constantan
|
49
|
x10-8
|
|
Carbon
(graphite)
|
3-60
|
x10-5
|
|
Germanium
|
1-500
|
x10-3
|
|
Silicon
|
0.1-60
|
...
|
|
Glass
|
1-10000
|
x109
|
|
Quartz
(fused)
|
7.5
|
x1017
|
|
Hard rubber
|
1-100
|
x1013
|
