錫球為何會黏在銅版上


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請版上各位大大可以幫我解惑錫球為什麼會吸附在銅版上嗎?

是因爲靜電嗎?但是銅版是有接地的,理論上也被導掉了!?

還是因爲這2個材質本身所帶有的電子所造成相吸的?(跟金屬鍵有關嗎?)

懇求大大~

 

 

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