Why use a lightweight aluminum rod as a lead in the magnetic field?
Change the current size of the lightweight aluminum rod, aluminum rod through the observation of light swing amplitude comparison; electric light aluminum rod swing amplitude, in order to determine the magnetic field of electric current of lightweight aluminum rod force and lightweight aluminum rod in size.
Thus, the subsequent test error caused by the magnetization of the material can be eliminated.The magnetic field is a powerful effect on the electrified light aluminum rod, and the motor is made of this principle.
Light aluminum rods will not be magnetized and, of course, they can be replaced by pure copper that won't be magnetized,Because of the magnetic material in the magnetic field will be affected by the magnetic field displacement, and light aluminum rods will not.
