An electrically neutral penny, of mass m=3.11 g, contains equal amounts of positive and negative charge.
(a) Assuming that the penny is made entirely of copper, what is the magnitude q of the total positive (or negative) charge in coin?
(b) Suppose that the positive charge and the negative charge in a penny could be concentrated into two seperate bundles, 100 m apart. What attractive force would act on each bundle?

Question

An electrically neutral penny, of mass m=3.11 g, contains equal amounts of positive and negative charge.
(a) Assuming that the penny is made entirely of copper, what is the magnitude q of the total positive (or negative) charge in coin?
(b) Suppose that the positive charge and the negative charge in a penny could be concentrated into two seperate bundles, 100 m apart. What attractive force would act on each bundle?

noelgreco · Answer

How many moles of Cu in the penny?

anonymous · Answer

I think we can find the moles using the mass. Can I ask what is the formula? thanks.

noelgreco · Answer

I'm sorry.  If you don't know how to calculate moles from a given mass of an element, this question is beyond you.

Back up, slow down.  Get the basics under your belt.

Good luck.