r1 = r2, J1 = J2 = J. .
В1 = k*sqrt(J1^2 + J2^2) = k*sqrt(J^2 + J^2) = kJ*sqrt(1 + 1) = kJ*√2.
B2 = k*sqrt((2*J1)^2 + (5*J2)^2) = k*sqrt((2J)^2 + (5J^)2) = kJ*sqrt(4 + 25) = kJ*√29.
B2/B1 = kJ*√29/(kJ*√2) = √29/√2 = √(14,5) = 3.808 = 3,81.
Ответ: B2/B1 = 3,81.