磁場
磁場係種力場，磁性物質喺其中，會受磁力攝埋或者彈開。磁場由電流或者攝石生出來。磁場中點點，都有方向同強度，所以係矢量場。
強力嘅磁場，會令磁性物質變攝石。而地球本身，亦有磁場，所以指南針能辨方向。
磁場同電場，總合爲電磁場。磁場係電子流動引起，而電場係電子不動引起，兩者係一體兩面。喺量子力學入便，電磁場係由交換光子引致。
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