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JEE Main 2012 Physics question

PhysicsUnits and MeasurementJEE Main 2012

The electrical resistance R of a conductor of length l and area of cross section a is given by where ' ρ ' is the electrical resistivity. What is the dimensional formula for electrical conductivity ' σ ' which is reciprocal of resistivity?

Answer: (1)

Solution

, so $[ρ] = [R][a]/[l] =

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Question ID VK-103625