In the next section, we shall use the Biot-Savart law to calculate the
magnetic field due to a circular loop 4 5 MAGNETIC FIELD ON THE AXIS OF A CIRCULAR
CURRENT LOOP
In this section, we shall evaluate the magnetic field  due
to a circular coil along its axis The evaluation entails
summing up the effect of infinitesimal current elements
(I dl) mentioned in the previous section