Hello, below I will have 2 pictures below,
First) Is an enameled wire that I have wrapped around a plastic tube with 3 layers and each layer has about 120 turns, so 360 turns total. When i hook this up to my power supply through a basic push button ( that I learned not to press with my finger lol) and this draws the max 5amp from my power supply at around 18v.
Second) The other object is a 12v 250ma electromagnet.
I have several questions,
-In my wrapped enameled wire setup I noticed that it only works as an electromagnet when I place a small screw inside the tube and it doesn't work when I try it on the outside. ( I understand that the magnetic flux gets concentrated inside the tube),
but how is it that the second picture the store-bought 12v electromagnet works better as a contact Electro-magnet and the screw will stick to the side of it.
Is it the method it was wrapped?
-If I am wrapping from left to right in a clockwise manner. When I am finishing the first layer and i am all the way to the right, I keep the wire tight and cross it all the way to the left side in one big turn, then start wrapping from left to right once again. Is that correct? I am pretty sure.