Answer
(a) The current density is unchanged. Current density is defined as the current flowing through a conductor per unit cross-sectional area, and doubling the current does not change the cross-sectional area of the conductor.
(b) The conduction-electron density is unchanged. Conduction-electron density refers to the number of conduction electrons per unit volume, and doubling the current does not change the number of conduction electrons.
(c) The mean time between collisions is unchanged. The mean time between collisions is determined by the properties of the material and the temperature, and is not affected by the current flowing through the conductor.
(d) The electron drift speed is unchanged. The drift speed of the electrons is determined by the applied electric field and the resistance of the conductor, and is not affected by the current flowing through the conductor.
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