What is happening
You are called to an induction charging pad under a hospital trolley.
The receiver will not charge. Its 0.04 m² coil needs 0.012 Wb of flux, and the field strength is set too low to couple.
Magnetic fluxRunning
Coil flux
0.00256Wb
Required flux
0.012Wb
Coil flux is short by 0.00944 Wb
Field coil. Field strength at 0.064 T. Coil flux 0.00256 Wb, Required flux 0.012 Wb. Currently coil flux is short by 0.00944 Wb.
What has to balance