Large electric fields in cell membranes cause ions to move through the cell wall. The field strength in a typical membrane is 1.0 times 107 N/C. What is the magnitude of the force on a calcium ion with charge +e?

Explanation:

The given data is as follows.

          Electric field (E) =

          Charge (e) = C

Formula to calculate the magnitude of force is as follows.

                F = qE

                   =

                   =

Therefore, we can conclude that magnitude of the force on a calcium ion with charge +e is  .

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .