What is the magnitude of the force on a calcium ion with charge +e?

Large electric fields in cell membranes cause ions to move through the cell wall. The field strength in a typical membrane is 1.0 X 10^7 N/C.

F = Eq = 1.0×10^7N/C*1.60×10^-19C (Charge of a +e) = 1.60×10^-12N

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