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  4. In the equation AB = C , A is the current density, C is the electric field, Then B is

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Q. In the equation $AB = C , A$ is the current density, $C$ is the electric field, Then B is

Current Electricity

Solution:

$J =\sigma E \Rightarrow J \rho= E$
$J$ is current density, $E$ is electric field so $B =\rho=$ resistivity.