부산대학교 도서관

The effect of the magnetic drag force due to the eddy current on the magnet's motion was investigated by measuring the position and velocity of the magnet moving above a conductor plate. As the magnet moves along an inclined conductor plate, the drag force acting on the magnet increases and finally the magnet moves with a constant velocity called a terminal velocity. The terminal velocity values of magnet with respect to the incline angle were obtained by fitting the velocity curves with the theoretical ssolution of the magnet's equation of motion and were found to be proportional to the sine value of an incline angle. By using the obtained values of the terminal velocity, drag coefficients were also calculated and the average value was 0.16086 ±0.00721(㎏/s). From these experimental results and the equation of motion of the magnet, the magnetic drag force due to the eddy current was found to be proportional to the magnet's velocity.