Use the data in Table 12.2 to answer the following –

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

(b) Which material is the best conductor?

Fig 12.2.jpg

 

Answer

(a) 

Resistivity of iron = 10 × 10 -8  

Resistivity of mercury = 94 × 10 -8

 

Resistance is directly proportional to the resistivity.

Higher the resistivity, the higher the resistance.

Hence, resistance of mercury is more than resistance of iron.

Since iron would provide lower resistance to the flow of current, iron is a better conductor.

 

(b) The substance which has the lowest resistivity is the best conductor.

Silver has the lowest resistivity.

Hence, silver is the best conductor.

  1. Class 10
  2. Chapter 12 Class 10 - Electricity

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.