Flux in an electromagnet depends on current, permeability, and number of turns in the coil. More turns with the same current / core and you get more flux. That assumes you don't saturate the core. If you are talking about redesigning a motor for 1 vs 2A by changing the number of turns, the core likely isn't an issue. It's mostly a matter of filling the same winding area with the same amount of copper - divided into smaller strands.
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