A Circular Loop of Wire of Radius 10 Cm Carries

Multiple Choice

A circular loop of wire of radius 10 cm carries a current of 6A. The magnitude of the magnetic field at the center of the loop is

A) 3.8 × 10^-5 T.
B) 3.8 × 10^-7 T.
C) 1.2 × 10^-5 T.
D) 1.2 × 10^-7 T.
E) 3.8 × 10^-8 T.