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What is resistivity ? Write its unit. On what factors do resistivity depend? (AU India - 2011) |
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Answer» SOLUTION :`rArr` At given temperatur resistance of material, `R = rho (l)/(A)` `therefore rho = (RA)/(l) ` `rho` = resistivity of conductor `rArr` Definition : Resistance of conductor having unit length and unit cross-section area is called resistivity or specific resistance. `rArr` Value ofresistivity depend on type of material of conductor, TEMPERATURE and PRESSURE. `rArr` It does not depend on dimension of conductor.11 `rArr` Unit = `Omega` m(Ohm. m) and dimensional formula `= M^(1) L^(3) T^(-3) A^(-2)`. |
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