An Fe3+ ion is located 400 nm (400×10−9 m, about 4000
atomic diameters) from a Cl− ion. (a) Determine the magnitude and direction of the electric field E_A at location A, 100 nm to the left of the Cl− ion. (b) Determine
the magnitude and direction of the electric field E_B at location B,
100 nm to the right of the Cl− ion. (c) If an electron is placed at
location A, what are the magnitude and direction of the force on
the electron?