Twenty loops of wire are tightly wound around a round pencil that has a diameter
ID: 2245465 • Letter: T
Question
Twenty loops of wire are tightly wound around a round pencil that has a diameter of 5.79 mm. The pencil is then placed in a uniform 4.93-T magnetic field, as shown in the figure. If a 3.15-A current is present in the coil of wire, what is the magnitude of the torque on the pencil?
Twenty loops of wire are tightly wound around a round pencil that has a diameter of 5.79 mm. The pencil is then placed in a uniform 4.93-T magnetic field, as shown in the figure. If a 3.15-A current is present in the coil of wire, what is the magnitude of the torque on the pencil?Explanation / Answer
Torque = NIABSin(60 degree)
= 20*3.15*pi*(0.5*5.79*10^-3)^2*4.93*Sin(60 degree)
= 0.00708 Nm