What Is the Magnetic Field at the Center of a Circular

Multiple Choice

What is the magnetic field at the center of a circular loop of wire of radius 4.0 cm when a current of 2.0 A flows in the wire?

A) 0 T
B) 1.3 × 10^-6 T
C) 1.3 × 10^-5 T
D) 3.1 × 10^-5 T
E) 3.1 × 10^-6 T