When you sculf your feet on a carpet, you gain electrons and become negatively charged. If you then place your finger near metallic surace, such as a doorknob, an electric firld develops between your finger and the doorknob. As your finger gets closer to the surface, the magnitude of the electric field increases. When it exceeds a thershold of 3 MV/m the air breaks don, creating a small "lightning" strike, which you feel as a shock. Suppose that the distance between your finger and a dooknob at the point you feel the schock is 2 mm.
Using the estimate and the threshold field strength of 3 mv/m , find the potential between your finger and the doorknob.
V = ___ ____
