28. Magnetic Fields and Forces

A loop of wire with a radius of $2.0\mathrm{cm}$ lies in the $xy$ -plane and is centered on the origin. It carries a counterclockwise current of $1.0$ A when viewed from above the $xy$ -plane. A long, straight wire lies along the line $y=-2.0\mathrm{cm}$. so that it is tangent to the lowest point on the loop. This straight wire carries a current of $1.0\text{A}$ in the negative x-direction. What is the strength of the magnetic field at the center of the loop?