Question

pls answer me about this question ..
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Answer 1

Explanation:

a)

R=ρl/A

ρ=R.A/l

resistivity is one kind of measure of resistence or we can see in the above equation that resistence is directly proportional to resistivity.

so,materials having more resistivity have more resistence.

conductor:which have less resistence.

insulators:which have more resistence.

among A, B,C

B has high resistivity so it is insulator

A,c have less resistivity compared to B,so they r conductors

b)R=ρl/A

R=kl

R1/R2=L1/L2

4/R2=1/2

R2=8 ohms

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