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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity2 Marks
Question
Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it.
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Answer

Resistivity, $\rho=\frac{\text{R}\times\text{A}}{\text{I}}$
Where, R is the resistance of the conductor.
A is the area of cross section of the conductor.
I is the length of the conductor.

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