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Photo of two girls, one with her hair standing on end
两个因馆内实验而兴奋不己的女孩 自由女神科技展览中心(Liberty Science Center)的露宿活动200025

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拥有同一电极的物体会彼此相斥,当照片中的女孩触摸静电球时,静电球内的静电会传至她的全身及所有的发丝内,因为每一丝头发内都拥有相同的电极,所以造成它们彼此相斥,因而竖立在头皮上(这项实验可于博物馆的安全环境内进行,请 于其他场所试验)。


Why is this girl's hair standing on end? It is this way because of static electricity.

Everything is made up of millions of tiny particles, called atoms. Inside atoms are protons and electrons, which have positive and negative electric charges. When you rub two things together, some of the negative charges, or electrons, move from one surface to the other. The object that loses electrons becomes positively charged, and the one that gains electrons becomes negatively charged. Opposites (positive and negative) attract, so the objects pull together. This is static electricity.

Objects with the same charge push away from each other. When the girl in the photo touches the ball with static electricity inside it, it sends a static charge through her body and into each strand of hair. Because each strand has the same charge, the strands push away from each other, so her hair stands up. (This experiment was done in the safety of a museum; it is not something to try anyplace else.)

Experiments like these are best attempted in a museum. The girls in the photograph are visiting the Liberty Science Center in New Jersey. Several times a year, the center holds a "Camp-In," where groups of kids have fun with the science exhibits until late at night, and then they sleep over in the museum.

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