Question

13. i) Observe the following table. Which of the material can be used for

transmission of electricity, heating material and insulator, and why ?

Material Resistivity (Ωm)

A

B

C

1.62 x 10-8

100 x 10-6

1 x 1010

ii) How does the resistance of a conductor vary with its length ?​

Answer 1

Answer:

option a ) 1.62× 10-8 is the answer

ii) directly propotional or as length increase ,resistance increase ,r~1