Answer:
The magnetic effect of a current coil depends on the number of turns, and the stronger the more turns the coil has.
If you double the number of turns, the magnetic field B in the center of the circular coil, with constant current will double.
The magnetic induction inside the long solenoid is equal to
"{\\displaystyle B={\\frac {4\\pi }{c}}{\\frac {NI}{l}}};"
where B is the magnetic induction, c is the speed of light, N is the number of turns, l is the length of the coil.
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