JEE Advanced 2020 Concept Recapitulation Test 2 Paper 1

Three infinitely long thin conductors are joined at the origin of coordinates and lies along the x,y and z axes. A current i flowing along the conductor lying along the negative x -axis divides equally into the other two at the origin. If the magnitude of magnetic field at the point (0,−a,0) is n‌

µ0i

4πa

then find the value of ' n '.