Same current I is flowing in three infinitely long wires along x, y and z directions. What is the magnetic field at point `(0, 0, -a)`?

Same current i is flowing in the three infinitely long wires along positive x-,y- and z-directions. The magnetic filed at a point (0,0,-a) would be

Same current i is flowing in the three infinitely long wires along positive x-,y- and z-directions. The magnetic filed at a point (0,0,-a) would be

Equal currents are flowing in three infinitely long wires along positive x,y and z -directions. The magnetic field at a point (0,0-a) would be ( i= current in each wire)

Same current l is flowing through 3 infinite long thin wires along +ve x,y,z axes. Find the net magnetic induction at a point (0,0,-a) such that yz plane is in the plane of the paper (i,jk are the unit vectors along x,y and z axes respectively)

Equal currents i, i are flowing through two infinitely long parallel wires. What will be the magnetic field at a point midway, when the currents are flowing in the same direction.

Current I is flowing through a vertical long wire in the upward direction. The magnetic field at a point on the east of the wire is

A current of 5 A is flowing east to west in an infinitely long wire kept along east-west direction. Find magnetic field in a vertical plane at a distance 50 cm below the wire