阿摩線上測驗
20. A square coil consists of $N = 10$ closely wrapped turns and has side length $a = 0.50 \, \text{m}$. The coil is hinged along the y-axis, and its plane makes an angle $\theta = 60.0^{\circ}$ with the x-axis, as shown in the figure. The current in the coil is $I = 1.50 \, \text{A}$ in the direction indicated, and the coil is placed in a uniform magnetic field $B = 0.40 \, \text{T}$ directed along the positive x-axis. What is the torque exerted on the coil by the magnetic field, and what is its direction when viewed from above (looking down along the +y-axis)?
(A) $0.75\mathrm{N}\cdot \mathrm{m}$ clockwise
(B) $0.75\mathrm{N}\cdot \mathrm{m}$ counter-clockwise
(C) $1.3\mathrm{N}\cdot \mathrm{m}$ clockwise
(D) $1.3\mathrm{N}\cdot \mathrm{m}$ counter-clockwise
(E) None of the above
統計： 尚無統計資料
