Does a 1-turn coil with 100ma through it generate the same magnetic field as the same size coil with 4 turns at 25ma?

I know you want to know why I'm asking this. In my GPS-WWVB project I have a 4 turn coil acting as an antenna for the 60KHz carrier. At least my prototype had a 4-turn coil. My final project's antenna used a 100-ft 4-conductor phone cable with RJ11s on each, and it was wired at the connector ends to jump one conductor to another so that all 4 conductors were part of the coil. I just noticed that the RJ11 connectors on each end of the cable were reversed from each other - the result being that I had only 1 turn in the coil. I can't tell any difference in performance between the prototype coil of 4 turns and the final one with 1 turn, but I'm curious to know if it really is the same power level.

Edit: There's more. Looking carefully at the crossover wiring at the connector ends, the reversed connectors also resulted in 2 (of the 4) of the conductors connected to form a 2-turn shorted coil and one (out of 4) of the conductors being a 1-turn shorted coil. All within the sheath of the phone cable, i.e., really close together. Wonder what effect THAT would have on the field strength.

 

Yes, if everything else is held constant. This shows that magnetic field strength H is proportional to the number of turns N and current I.

 

View attachment 119967

Yes, if everything else is held constant. This shows that magnetic field strength H is proportional to the number of turns N and current I.

Thanks Dick. What do you think those shorted turns would do to the field?

 

For a static (DC) field a shorted turn would have no effect. As the frequency increases from zero the shorted turn would induce a magnetic field that tends to cancel the field from the driven coil, the amount of cancellation depending upon the geometric relationship between the two coils and the frequency.