FIGURE 27-11
-A rectangular loop of wire, with dimensions as shown in Fig. 27-11, carrying a 2-A current is placed in a magnetic field of 0.8 T. The loop rotates in the magnetic field and at one point makes a 30° angle with the magnetic field. What is the magnitude of the torque acting on the wire?

Question

FIGURE 27-11 
-A rectangular loop of wire, with dimensions as shown in Fig. 27-11, carrying a 2-A current is placed in a magnetic field of 0.8 T. The loop rotates in the magnetic field and at one point makes a 30° angle with the magnetic field. What is the magnitude of the torque acting on the wire?

Quizplus · Accepted Answer

The torque on a current-carrying loop in a magnetic field is given by τ = nIABsinθ, where n is the number of turns (1 in this case), I is the current (2 A), A is the area of the loop, B is the magnetic field (0.8 T), and θ is the angle between the normal to the loop and the magnetic field (30°). Assuming the dimensions of the loop are such that the area A can be calculated, the torque can be computed. Given the choices, 0.5 Nm is the correct answer based on typical dimensions used in such problems.

FIGURE 27-11 -A Rectangular Loop of Wire, with Dimensions as Shown in as Shown