The following six procedures can be used to charge two neutral spheres with similar charges of exactly identical magnitude.
(i) Place a negatively charged rod near a neutral metal sphere.
(ii) Apply a net negative charge to the rod-sphere system by touching the neutral sphere with the negatively charged rod.
(iii) Remove the rod from the spherical. Now the sphere is negatively charged.
(iv) Move this negatively charged sphere near the second neutral sphere.
(v) Make contact with these two spheres. The surplus negative charge is evenly spread across the two spheres
(vi) Divide the spheres. The surplus charge has the same sign as the charge on the charging rod and is spread evenly across the two spheres.