55 A long cylindrical coil of inductance L is wound on a

Last updated: 6/13/2023

55 A long cylindrical coil of inductance L is wound on a bobbin of diameter D The magnetic induction in the coil connected to a current source is B After rewinding the coil on a bobbin of diameter D its inductance becomes L Determine the magnetic induction B of the field in the new coil connected to the same current source assuming that the length of the wire is much larger than that of the coil