Yes
The direction of the magnetic moment is perpendicular to the current loop in the right-hand-rule direction, the direction of the normal to the loop in the illustration. Considering torque as a vector quantity, this can be written as the vector product. Torque on a Current Loop in a Uniform Magnetic Field. In the previous topic, we showed how a force is exerted on a current-carrying conductor placed in a magnetic field. With this as a starting point, we now show that a torque is exerted on any current loop The fact that current carrying loops experience a net torque in a magnetic field is the principle behind the electric motor, where the electrical energy involved in establishing a current is converted into the mechanical energy of rotating a shaft. A uniform magnetic field exerts no net force on a current loop but it does exert a net torque. Let's say the magnetic field is in the plane of the loop and is parallel to two sides. If the loop has a width a, a height b, and a current I, then the force on each of the left and right sides is F = IbB. A convenient expression for the torque exerted on a loop placed in a uniform magnetic field B is. Where A, the vector shown in Figure 29.13, is perpendicular to the plane of the loop and has a magnitude equal to the area of the loop. Interaction of a Current Loop with a Magnetic Field. Part A = Yes, the net torque acting on the loop is positive and tends to rotate the loop in the direction of increasing angle theta (counterclockwise). Part B = 0.000104 N*m. A loop of wire will experience zero net force, but there will be a net torque. The operation of galvanometers, generators, and electric motors are based on the torque exerted on a current loop. Consider a loop of wire in a magnetic field. Although this is generally true, there is a net torque on a current loop in an external field, and this torque tends to rotate the loop. To understand this, first consider a rectangular loop carrying a current/ in the presence of a uniform magnetic field in the plane of the loop as in Fig. [5.23 (a)]. What is the force on section a-b of the loop? a) zero b) out of the page c) into the pageA square loop of wire is carrying current in the counterclockwise direction. There is a horizontal uniform magnetic field pointing to the right.
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is there a net torque on the loop of wire from the magnetic field