The discussion up to this point has been directed to theeffects on an internal organ of the currents and fields inducedin that organ by an external electric field. There areexternal effects as well. As shown by King and Wu [12],the currentsgenerated in the human body byalternately charge the surface of the upper and lower halves ofthe bodyand. These charges generate an electric field inthe air outside of the body. This is perpendicular to the surface