Four parallel long wires are placed along the edges of a cube of side L=23 cm. Each wire has a current of 1.5A running through it. All currents are...

Four parallel long wires are placed along the edges of a cube of side L=23 cm. Each wire has a current of 1.5A running through it. All currents are in the same direction. Find the magnitude of the magnetic field at the centre of the cube.