HW (for Thursday E and Friday A classes)

Electrostatics homework – to play around with; NOT to be collected

1.  Define charge.

2.  Explain why a charged balloon will stick to a (neutral) wall.

3.  What is the charge (in coulombs) of a electron?

4.  How many protons does it take to make 15 coulomb of charge?

5.  In any atom, which particle(s) are fundamental and which are composite (made of smaller particles)?

6.  You have two clusters of charge:  10 C and 20 C, separated by 1-m of distance.

a.  Use Coulomb’s law to calculate the force that exists between the charges.

b.  Is this force attractive or repulsive?

c.  If you were to quadruple the distance between the charges, what exactly would happen to the amount of force between the charges?

7.  Carbon is element number 6.

a.  What does the 6 represent?

b.  What do you suppose is the difference between Carbon-12 and Carbon-14?

8.  Why do you think that electrons orbit protons (and not the other way around)?

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Sites from class:

http://www.falstad.com/vector3de/

http://www.falstad.com/emstatic/index.html