Magnetic Effects of Electric Current — Science STD 10 — Question

The magnetic field will be stronger near the circumference of the loop as , the magnetic field lines are more crowded near the circumference , more the lines are crowded the stronger the magnetic field is.
Electric current in a circular loop creates a magnetic field which is more concentrated in the center of the loop than outside the loop. Stacking multiple loops concentrates the field even more into what is called a solenoid.