Magnetic Fields Produced by Currents Problem

[MrDMD83]

A circular loop of wire and a long, straight wire carry currents of I1 and I2 (see the drawing), where I2 = 4.9I1. The loop and the straight wire lie in the same plane. The net magnetic field at the center of the loop is zero. Find the distance H, expressing your answer in terms of R, the radius of the loop.

 

[OlderDan]

A circular loop of wire and a long, straight wire carry currents of I1 and I2 (see the drawing), where I2 = 4.9I1. The loop and the straight wire lie in the same plane. The net magnetic field at the center of the loop is zero. Find the distance H, expressing your answer in terms of R, the radius of the loop.

What have you tried to do to solve this problem? There is no drawing, but I assume H is the distance from the straight wire to the center of the loop. If so, all you need to do is find the field from a current loop at its center and from a wire and set them equal and opposite.