What is the resistance R of a 51.7mlong aluminum wire that has a diameter of 7.27 mm? The resistivity of aluminum is 2.83 x 10-3 -m. Cell membranes contain channels that allow ions to cross the phospholipid bilayer. Suppose that a particular potassium channel carries a current of 1.8 pA. How many potassium ions (K+) pass through it in 1.0 ms? If a currentcarrying wire has a crosssectional area that gradually becomes smaller along the length of the wire, the drift velocity 0 increases along the length of the wire. O decreases along the length of the wire. O remains the same along the length of the wire. O increases along the length of the wire if the resistance increases too. O decreases along the length of the wire if the resistance decreases too