Are the cytosol and extracellular fluids electrically neutral?

Question

I've found several sources that state that overall, the cytosol of a cell is electrically neutral. The extracellular fluid is also purportedly electrically neutral. How can that be when we have membrane potentials?Also in that regard, how do the ion transporters that set up the membrane potential know when to stop pumping ions to get a certain potential set up?

Answer 1

The cytosol is a net negative charge and the extracellular fluid is a net positive charge.

The ion transporters (sodium/potassium pumps) ensure a net negative charge by constantly pumping 3 positively charged ions out of the cell for every 2 positively charged ions pumped into the cell. The negative charge inside the cell is also maintained by negatively charged particles such as Cl-