It don't think it will be sensitive enough at low frequencies (50/60Hz), there's nowhere near enough mutual inductance compared to using a magnetic-cored transformer. Try winding the coil on a ferrite toroid.
It don't think it will be sensitive enough at low frequencies (50/60Hz), there's nowhere near enough mutual inductance compared to using a magnetic-cored transformer. Try winding the coil on a ferrite toroid.