Coulomb's law hw

Now that we have reviewed Coulomb's law, play with these:

1.  What is the force between an electron and a proton in a hydrogen atom, separated by the Bohr radius of 53 pm (x 10^-12 m)?

2.  Is the force in the above problem attractive or repulsive?

3.  How many protons are required to give a charge of 5 C?

4.  Consider a sodium ion with a net +2 charge.  Keeping in mind that chemists usually drop the 'e' part of the charge, what is the total net charge on that atom?

5.  Read about the concept of electric field.  How do we draw them?  What do the field lines represent?  A good place to start is physicsclassroom.com, and look under the static electricity section.

Physics - yay!