The solution of the problem 2.46 cr 2 from the problem

PROBLEM 2.46
Two circular turns with a current lie in one plane and have a common center. The radius of the great turn is 12 cm,
Less than 8 cm. The field strength in the center of the turns is 50 A / m, if the currents flow in one direction,
And zero if in the opposite. Determine the strength of currents flowing through circular turns.