Science studies the motion of the train magnets train magnet in a coil of copper to various factors that affect the speed and strength of the magnetic train by factors that affect the speed and power are. Of the length of the coil. Cross-sectional area of the coil mass of the train. The number of train-mounted magnets, buttons, and features magnetic studs. The factors in the study. The number of train-mounted magnetic studs The trial will use a camera to record video and use the program to calculate the speed and capacity.
การแปล กรุณารอสักครู่..
![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)