Use the data in Table on page 23 of this book to answer the following: (a) Which among iron and mercury is a better conduction? (b) Which material is the best conductor?

NCERT - Science

Book: NCERT - Science

Chapter: 12. Electricity

Subject: Physics - Class 10^th

Q. No. 5 of In Text Questions-Pg-209

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5

Use the data in Table on page 23 of this book to answer the following:
(a) Which among iron and mercury is a better conduction?

(b) Which material is the best conductor?

(a) The electrical resistivity of iron is . And, the electrical resistivity of mercury is . Since the resistivity of mercury is greater than that of iron, it will offer more hindrance to current flow as compared to iron. Therefore, iron is a better conductor than mercury.

(b) Silver metal has the lowest resistivity nearly about 1.60 x 10^-8m. Therefore, silver metal is the best conductor of electricity.

5

Chapter Exercises

In Text Questions-Pg-200

In Text Questions-Pg-202

In Text Questions-Pg-209

In Text Questions-Pg-213

In Text Questions-Pg-216

In Text Questions-Pg-218

Exercise-Pg-221

1

On what factors does the resistance of a conductor depend?

2

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

3

Let the resistance of an electrical component remain constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

4

Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?

5

Use the data in Table on page 23 of this book to answer the following:
(a) Which among iron and mercury is a better conduction?

(b) Which material is the best conductor?