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To find the current density (J) of a material, we can use the relation given by Ohm’s law in a differential form which relates the electric field (E) to the current density (J) through the material’s resistivity (rho). The formula is given by:
[ J = frac{E}{rho} ]
Given:
– The resistivity (rho = 20) units
– The electric field intensity (E = 2000) units
By substituting the given values into the formula, we get:
[ J = frac{2000}{20} = 100 ]
Therefore, the current density (J) of the material is (100) units.