MAGNETIC ROTARY DISC

The utility model relates to a magnetic rotary disc for physics teaching, which is composed of a base, an electric magnet, a rotary disc a commutator and an electric brush, wherein, the rotary disc and the commutator are in coaxial rotation, and the electric brush is in contact with the commutator. The rotation of the rotary disc is started and maintained through the sucking action of the electric magnet on a spherical steel ball on the rotary disc, the inertial effect and the centre of gravity shift of the spherical steel ball so that physical phenomena, such as the action of the magnetic force, the phenomenon of inertia, the action of the gravitational field, etc. are demonstrated, and that residual magnetism is very weak after the spherical steel ball is demagnetized can be illustrated through the dual AC/DC application. Moreover, the utility model has the advantages of simple structure and convenient manufacture and is an ideal tool for physics teaching.