We are currently learning about solenoids in my physics class, and am very confused about where this potential drop comes from across a solenoid. I understand that an opposing electric field is created when a switch is first opened because of Faradays Law and the fact that the magnetic flux inside the solenoid is changing. Is this opposing field the reason there is a voltage? Is this voltage then just temporary until it reaches steady state? Or is theres always a voltage across the inductor?