Fig. 2. (Color online) (a) Free-body diagram of a permanent magnet subjected to a drag force F→D, tension T→, and gravitational force mg→ while positioned at a distance d from a vertically rotating copper plate with angular velocity ω. (b) Experimental setup for measuring the drag force FD acting on the vertically rotating copper plate, and (c) setup for measuring the angular velocity ω of the horizontally rotating copper plate, featuring a CdS photo sensor, light-emitting diode (LED), permanent magnets, direct current motor, oscilloscope, and power supply for CdS and LED.
© NPSM
