Consider a short wire of length L, carrying a current I to the left. Define coordinates so that the wire is along the t axis, the current flows in the-i direction, the y axis is vertical in the plane of the page and the axis points out of the page. Which of the following expressions is an ap- proximate expression for the magnetic field at a point P on the g axis very close to the wire, i.e. a distance y

Consider a short wire of length L, carrying a current I to the left. Define coordinates so that the wire is along the t axis, the current flows in the-i direction, the y axis is vertical in the plane of the page and the axis points out of the page. Which of the following expressions is an ap- proximate expression for the magnetic field at a point P on the g axis very close to the wire, i.e. a distance y