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 with a diameter of 15.0 cm that carries a current of 1.50 A?

A) zero
B) 6.28 $\times$ 10^-6 T
C) 1.26 $\times$ 10^-5 T
D) 2.51 $\times$ 10^-5 T
E) 1.68 $\times$ 10^-4 T