Question

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Guys✌

(A) _______What do you understand by "resistivity" of substance ______________


(B) _________ A wire is 1.0 m long 0.2mm diameter and has a resistance of Ω

calculate the resistivity of its material..??


I will mark it brainlist ​

Answer 1

Answer:

Resistivity or specific resistance of a body is a characteristic by which one can judge the electrical property of a substance. As the name suggests, resistivity is associated with the resistance to electrical flow of electrons. Resistivity quantifies how strongly a material opposes the flow of electrons through it.

Here , it is Given that:

l=1m ,d=0.2mm=>r=0.1mm and R=10 ohm

by using the formula,

R= p౹/ A

= p౹/ πr²

therefore, p= Rπr²/l

= 10× 3.14×( 0.1× 10 -³)²

= 10× 3.14× 0.1×0.1× 10 to the power -6

= 0.314× 10 to the power-6

= 3.14× 10 to the power-7 ohm- m

hence, the resistivity of the conductor is 3.14× 10 to the power-7 ohm- m

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