eli5: why do we use coils to generate a magnetic field? why does adding more coils increase the magnetic field strength better than other shapes?

Question

Why a coil shape basically, why not some other shape, why is a coil more advantageous?

In: 13

Answer 1

One wire creates a weak field. The next wire adds to it, and the next wire adds more, and so on. In a loop, both sides of the loop add together in the middle of that loop, while on the outsides they are competing.

A stack of loops, a coil, creates a strong field inside.