Hello there!

Greetings!

Ampere's Law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop .

So if you apply the above law you will get that magnetic field strength at the center of a circular loop is given by :-

B=μ0I2R (at center of loop ), where R is the radius of the loop . RHR-2 gives the direction of the field about the loop .

thankyou