Specifications: This apparatus can be used for the study of the magnetic force which acts upon a metal object. When the circular base is spun, the metal pendulum moves accordingly. This apparatus set consists of 1 metal pendulum with diameter of 2cm which is attached by a string; it is set to be in the center of the circular base. The circular base has a diameter of 25cm. It can be spun on a rectangular base with dimensions 42x42x12cm. It is made of MDF wood closed with Formica plastic.