Qib 10 tau kawm electromagnetism hauv lawv chav kawm Science. Raws li qhov yooj yim solenoids, lawv tau tsim lawv tus kheej ua haujlwm hluav taws xob motors thiaj li yuav nkag siab tias lawv tig tig li cas. Koj tuaj yeem pom qee cov duab ntawm lawv cov haujlwm hauv qab no.