**Question:**For a uniform electric field and uniform current density both parallel to the length of a wire, if the electric field magnitude doubles, the current density doubles.- ○ True- ○ False**Explanation:**This statement is related to Ohm's Law, which states that the current density \( J \) is directly proportional to the electric field \( E \) in a conductor, with the relation given by \( J = \sigma E \), where \( \sigma \) is the conductivity of the material. Therefore, if the electric field magnitude doubles, the current density also doubles, assuming the material's conductivity remains constant.

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For a uniform electric field and uniform current density both parallel to the length of a wire, if the electric field magnitude doubles, the current density doubles. O True O False 4