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Question 5:

Use the data in Table 12.2 to answer the following −

Table 12.2 Electrical resistivity of some substances at 20°C

Material

Resistivity (Ω m)

Conductors

Silver

1.60 × 10−8

Copper

1.62 × 10−8

Aluminium

2.63 × 10−8

Tungsten

5.20 × 10−8

Nickel

6.84 × 10−8

Iron

10.0 × 10−8

Chromium

12.9 × 10−8

Mercury

94.0 × 10−8

Manganese

1.84 × 10−6

Constantan

(alloy of Cu and Ni)

49 × 10−6

Alloys

Manganin

(alloy of Cu, Mn and Ni)

44 × 10−6

Nichrome

(alloy of Ni, Cr, Mn and Fe)

100 × 10−6

Glass

1010 − 1014

Insulators

Hard rubber

1013 − 1016

Ebonite

1015 − 1017

Diamond

1012 − 1013

Paper (dry)

1012

(a) Which among iron and mercury is a better conductor?

(b) Which material is the best conductor?

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