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State macroscopic form of Ohm's law. |
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Answer» Solution :Current densityJ at a point in a conductor is the amount of current flowing per unit area of the conductor around that point provided the area is held in a direction NORMAL to the current. `J=(I)/(A)` Drift velocity, `V_(d)=(eE)/(m)tau` `I=n eAV_(d)=n eA((eE)/(m))tau "" [J=(I)/(A), sigma =(n e^(2)tau)/(m)]` `(I)/(A)=((n e^(2)tau)/(m))E` `J=sigmaE` |
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