A Flat Circular Loop of Wire Is in a Uniform $0.30 \mathrm {~T}$

A flat circular loop of wire is in a uniform magnetic field of $0.30 \mathrm {~T}$ . The diameter of the loop is $1.0$ $\mathrm { m }$ , and a 2.0-A current flows in it. What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the magnetic field?

A) $0.00 \mathrm {~N} \cdot \mathrm { m }$
B) $0.47 \mathrm {~N} \cdot \mathrm { m }$
C) $0.52 \mathrm {~N} \cdot \mathrm { m }$
D) $0.41 \mathrm {~N} \cdot \mathrm { m }$

Correct Answer:

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