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**1. Homework Statement**

A circular loop in the XY plane of radius R and with current I moving in the counterclockwise direction. Compute B at (L,0,0) for L >> R0.

**2. Homework Equations**

Biot–Savart law

dB= μ0I/4∏ *(dl X r)/r^2

**3. The Attempt at a Solution**

I know that the B on the axis perpendicular to the plane of loop is μ0IR^2/ [2*(z^2/+R^2)^(3/2)].

But I don't know how to solve the problem when it is on the axis of the plane of loop. Thanks for any helps