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प्रश्न
Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it.
समीकरण/सूत्र
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उत्तर
Resistivity (ρ) = `R xx A/l`
Where,
R is the resistance of the conductor.
A is the cross-sectional area of the conductor.
l is the length of the conductor.
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पाठ 4: Electricity - Exercise 4 [पृष्ठ २१५]
