I have these two very large (ferrous core) coils, They are basically identical, each 200mm long and have a diameter of 100mm. The core is medium grade steel One coil is receiving an input of 8V(peak-to-peak) @ 4 MHz from the function generator. The second coil is placed 1m away, and is connected only to an oscilloscope where it showing 20mV(peak-to-peak) while the transmitting coil is operating. My question is this: when I bring the palms of my hands close to the poles of the transmitting coil I get an increase of up to 40mV(peak-to-peak) measured voltage on the secondary coil. What effect is the close proximity of my body having on the poles of the primary coil?