A Flat Circular Coil of Wire Having 200 Turns and Diameter

Multiple Choice

A flat circular coil of wire having 200 turns and diameter $6.0 \mathrm {~cm}$ carries a current of $7.0 \mathrm {~A}$ . It is placed in a magnetic field of $0.60 \mathrm {~T}$ with the plane of the coil making an angle of $30 ^ { \circ }$ with the magnetic field. What is the magnitude of the magnetic torque on the coil?

A) $5.4 \mathrm {~N} \cdot \mathrm { m }$
B) $1.0 \mathrm {~N} \cdot \mathrm { m }$
C) $2.1 \mathrm {~N} \cdot \mathrm { m }$
D) $1.2 \mathrm {~N} \cdot \mathrm { m }$
E) $3.9 \mathrm {~N} \cdot \mathrm { m }$