Solution to task 402 from Chertov´s for extramural stud

Solution to task 402 from Chertov´s for extramural stud

402. Magnetic moment pm of a thin conducting ring pm = 5 A.m2. Determine the magnetic induction B at point A, located on the axis of the ring and remote from the points of the ring at a distance r = 20 cm (Fig. 50).