Genius Jnr - 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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Sohni

20 Jun 2016

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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