A wire in the form of a tightly wound solenoid is connected to a DC source, and carries a current. If the coil is stretched so that there are gaps between successive elements of the spiral coil, will the current increase or decrease? Explain.
The current will increase. As the wires are pulled apart the flux will leak through the gaps. Lenz’* law demands that induced e.m.f. resist this decrease, which can be done by an increase in current.
