Microscopic form of ohm's law in usual notation is (1) \( \vec{J}=\...

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Microscopic form of ohm's law in usual notation is
(1) \( \vec{J}=\sigma \vec{E} \)
(2) \( \vec{J}=\rho \vec{E} \)
(3) \( \vec{J}=R \vec{E} \)
(4) \( \vec{J}=\frac{\vec{E}}{R} \)
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