Prove that, if an insulated, uncharged conductor is placed near a charged conductor and no other conductors are present, the uncharged body must be intermediate in potential between that of the charged body and that of infinity.
• Equation , show that electric potential decreases along the direction of electric field
• Consider any path from the charged conductor to the uncharged conductor along the electric field
• the potential will be continually decreases along this path
• a second path from the uncharged conductor to infinity will again continually lower than potential further hence the result