Question

Write an expression for the resistivity of a substance​

Answer 1

Answer:

(d)RESISTIVITY (rho = RA/l where R=Resistance;A = area of cross section; l = length) depends on temperature and nature of material using which the wire is made. RESISTIVITY dosent depend on length and area of cross section of the wire.

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Answer 2

Explanation:

resistivity of a substance is given by R

l =length of the substance

a= area of the substance

res= r×a/I

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