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Standard X
Physics
Resistivity
Resistivity o...
Question

Resistivity of some material is given below. State which one will be the best conductor.

MaterialCopperAluminiumSilverNickel
Resistivity (Ωm)1.62×10−82.63×10−81.60×10−86.84×10−8

A
Nickel
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B
Copper
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C
Aluminium
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D
Silver
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Solution

The correct option is D Silver
From the above table we find that of all the metals, silver has the lowest resistivity (1.60×10−8Ω−m), which means that silver offers the least resistance to the flow of current through it.
Hence, silver metal is the best conductor of electricity.

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Q.

Answer the following:

(1) P and Q are the two wires of same length and different cross sectional areas and made of same metal. Name the property which is same for both the wires and that which is different for both the wires.

(2) Resistivity of some material is given below. State which one will be the best conductor.

Material

Copper

Aluminium

Silver

Nickel

Resistivity (Ωm)

1.62 × 10−8

2.63 × 10−8

1.60 × 10−8

6.84 × 10−8

(3) If the resistance of wire A is four times the resistance of wire B, find the ratio of their cross sectional areas.

(4) Two dissimilar bulbs are connected in series, which bulb will be brighter?

Q. Question 5
Use the data in Table to answer the following –

(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor?

Table: Electrical resistivity of some substances at 20∘C
MaterialResistivity(Ωm)ConductorsSilver1.60×10−8Copper1.62×10−8Aluminium2.63×10−8Tungsten5.20×10−8Nickel6.84×10−8Iron10.0×10−8Chromium12.9×10−8Mercury94.0×10−8Manganese1.84×10−6AlloysConstantan(alloy of Cu Ni)49×10−6Manganin(alloy of Cu,Mn and Ni)44×10−6Nichrome(alloy of Ni,Cr,Mn and Fe)100×10−6InsulatorsGlass1010−1014Hard rubber1013−1016Ebonite1015−1017Diamond1012−1013Paper(dry)1012
Q. Question 5
Use the data in Table to answer the following –

(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor?

Table: Electrical resistivity of some substances at 20∘C
MaterialResistivity(Ωm)ConductorsSilver1.60×10−8Copper1.62×10−8Aluminium2.63×10−8Tungsten5.20×10−8Nickel6.84×10−8Iron10.0×10−8Chromium12.9×10−8Mercury94.0×10−8Manganese1.84×10−6AlloysConstantan(alloy of Cu Ni)49×10−6Manganin(alloy of Cu,Mn and Ni)44×10−6Nichrome(alloy of Ni,Cr,Mn and Fe)100×10−6InsulatorsGlass1010−1014Hard rubber1013−1016Ebonite1015−1017Diamond1012−1013Paper(dry)1012
Q. The electrical resistivity of a few materials is given below in ohm-metre. Which of these materials can be used for making element of a heating device?
A 6.84 × 10−8
B 1.60 × 10−8
C 1.00 × 10−4
D 2.50 × 1012
E 4.40 × 10−5
F 2.30 × 1017
​ Give reason for your answer.
Q. Two wires are of same length and radius but one of them is copper and the other is of iron. Which will have more resistance (Given resistivity of copper =1.62×10−8 ohm meter and resistivity of iron =10×10−8 ohm meter
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