1. The problem statement, all variables and given/known data (a) Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). What is the electric current density associated with the flow of these ions? b) What is the electric current in the pipe? 2. Relevant equations Not sure 3. The attempt at a solution I don't know the charge of water and don't understand what a singly ionized molecule is? I tried to look it up and there is an electron on the outside of the molecule. Does this mean I can use the density of water to get the charge of the water? and use that to find the current?