[問題] exert該如何圓滿解釋使net attractive force的解釋得以完整
本文：
A negatively charged rod would push the electron sea slightly
away, polarizing the metal to have a positive upper surface charge
and negative lower surface charge. Once again, these
are the conditions for the charge to exert a net attractive force
on the metal. Thus out charge model explains how a charged model
explains how a charged object of either sign attracts neutral
pieces of metal.
其實不只是exert，整段其實還是有太多不能了解的地方
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