1. The problem statement, all variables and given/known data 2. Relevant equations I = nqVA J = E/ρ J = I/A 3. The attempt at a solution The underlying assumption was that current was constant across all 3 bits of the conductor, and thus answer is b. The concept I can't grasp is this: Why is current constant? Shouldn't a smaller A mean smaller current as well? Is there a 'force' shoving more q through a smaller A to compensate and is there a mathematical way to show that current is indeed independent of area? Help is greatly appreciated!