Magnetic field of a solenoid Why, when explaining the magnetic field of a solenoid, are the individual "quasi-rings" split up into two layers with opposite direction of current (see attached pictures; where the x-es and the dots indicate opposite directions). The original picture given clearly states the direction of the current, so why does it "split up into two"?


 A: This is because the solenoid is made of current loops next to each other. In the picture the solenoid is cut in half.
A: that cross and dots indicates the direction of current "cross" means current enters that point and corresponding "dot "  means current leaves that point - as shown in figure (in my figure  current is in opposite direction to yours but i hope you'll understand)

solenoid is nothing but stack of rings with same central axis carrying current in same direction (here in CW direction looking from right side )
and that two loops in your figure indicates nothing but direction of magnetic field away from the axes of solenoid . remember it looks same as like  we get in the ring 
in gist i want to say take a current carrying ring as shown below and put them togeather with there central axis coinciding you will get same magnetic field lines like solenoid

A: Just cut the solenoid in image 1 from a horizontal diameter and indicate the direction of current again in its wires
Note:- the dots mean current is coming out and the crosses mean its going inside
