A toroid is made of 2000 turns of wire of radius 2.00 cm formed into a donut-shape of inner radius 10.0 cm and outer radius 14.0 cm. When a 30.0-A current is present in the toroid, the magnetic field at a distance of 11.0 cm from the center of the toroid is
A. 0.0857 T.
B. 0.109 T.
C. 0.120 T.
D. 0.600 T.
E. 0.685 T.
Answer: B
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