In 5. (bell. Electromagnetic motor. Crane. Electromagnetic lock. TV. In the application of the electromagnet of maglev train) 9. The advantage of electromagnets versus magnets is that the direction of the magnetic pole and the magnitude of the magnetic force can be changed Second unit earth ...
andisrepresented by"S". 9.whenmakingelectromagnets,thecoilsshouldbewoundinthe samedirectionontheironcore. In5.(bell.Electromagneticmotor.Crane.Electromagnetic lock.TV.Intheapplicationoftheelectromagnetofmaglev train) 9.Theadvantageofelectromagnetsversusmagnetsisthatthe directionofthemagneticpoleandthemagnitudeof...