I hope this is posted in the correct thread. When I was still in my physics class, we learned that a loop of wire with current can act as a self inductor. Just to refresh my memory: A loop of wire carrying current has a magnetic field around it due to current, however if the current changes, the magnetic field changes. This change in magnetic field makes the wire induce a current in the direction such that it opposes the change in magnetic field. Thus the induced current is in the direction opposite of the direction of the change in current. Thus a loop of wire is a self-inductor since it does not require any external magnetic field to induce a current, it just requires a change in current which causes a change in magnetic field. 1) Is this correct? Please correct me if I am wrong anywhere, since I'm just refreshing my memory. 2) My question: While a loop of wire can be a self-inductor, can a straight wire also be a self-inductor? 3) Another question: I also learned current can be induced if there is a magnetic field and a loop of wire rotates, or its area changes. In addition, current is induced if the magnetic field changes. By "magnetic field changes" does that mean the strength of the magnetic field changes? Hopefully this can be answered in simple terms. Thanks.