Two striaght long conductors AOB and COD are pendicular to each other and carry currents `i_(1)` and `i_(2)` . The magnitude of the magnetic induction at a point P at a distance a from the point O in a direction perpendicular to the plane ACBD is

Explanation

`(mu_0)/(2 pi a)(I_1^(2) + I_2^(2))^(1//2)`