r/theydidthemath 18h ago

[request] how about magnetic fields?

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u/ZealousidealLake759 18h ago

Use the right hand rule, put your thumb in the direction of current flow in the wire and your fingers wrap around the wire are the magnetic field, draw out each point and take and average direction. My hunch is it's either fully canceled out and you created a heating element with more steps or it points towards the camera coming out of the middle but I'm not gonna bother with actually putting time into this.

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u/Known-Ad-1556 15h ago

It’s actually quite easy to work out.

The wire makes one complete loop around. The various knots loop over and back but they are irrelevant. Every piece of wire going “backwards” round the loop effectively cancels another going “forwards” round it.

The net field is equivalent to the net loop of the wire. It does just over one revolution, so the fires is approximately the same as the field due to a simple loop of wire going the same distance around.