For the exact same reason a transformer works when it isn't grounded. Electromag...

jacquesm on March 31, 2022 | parent | context | favorite | on: How is portable AM radio possible?

For the exact same reason a transformer works when it isn't grounded. Electromagnetic fields do not require a ground. But adding a ground to an AM radio does help to boost the signal (as does a long wire antenna to the top of the hot side of the ferrite coil).