Wkb Chap. 2, CA # 1, C&S Chapter 2: Charges in Matter

Do NOT do the work on this notebook.  Do it on your own paper to turn in.

2.1.1   Force on a dipole:  Draw the force arrows representing forces due to each end of the dipole on Q and the net force on Q.  (Three arrows altogether.)

 Fon Q by dipole = (1/4¹e0) q Q (2s/d3) = .  What approximation had to be made to obtain this formula?

 

Plow through the algebra on pg 43, then do 2.1.1c,d, & e

 

2.2.1a  Why isn't all matter charged negatively?  (Hint:  Draw the force arrows representing forces due to the proton and the electron cloud on Q and the net force on Q.  (Three arrows altogether.)

 

 

 

 

2.2.2  Spheres look like point charges - Read page 46, then do 2.2.2 a & b.

 

 

 

2.2.3  Polarization of molecules explained, especially induced dipoles.

           Note the diagrams on page 48

Answer 2.2.3a

 

          

 

2.3  Why neutral objects attract charged objects.

           Be able to do 2.3.1 a & b on a test.  Draw both of these pictures here now to make sure you know how.

 

 

 

2.3.2  Create a permanent dipole and do 2.3.2 a,b & c.

2.3.3  Observing interactions with induced dipoles.  Hang a piece of paper from a piece of thread and move a charged rod near it.

2.3.3a.  How is this motion different from permanent dipoles?

 

 

 

 

2.4  Determining the sign of charge of a charged object.

2.4b   RBD  Can a neutral object repel a charged object?  (Good PTQ)

 

 

 

2.4c   Do this carefully, especially the verbiage.  Nonsense statements get you zero from now on.

 

 

 

2.5  Insulators and conductors - know the definitions, see page 52 

 

2.5.2a Discharge the bottom half of a charged tape.  Then explain how to tell whether or not a tape is a conductor.  Write your own answer before you look at the books answer.  Their answer has a problem.  (discuss the answer in the book)

 

 

 

 

 

2.6  Polarization of insulators- do 2.6a

 

 

 

 

2.7      Polarization of Conductors.  Make sure you read "An example of  proof by contradiction.

Be able to do 2.7.1a , 2.7.2a, 2.7.4

Do here now, 2.7.3a, 2.7.3b, 2.7.5 a&b

 

 

 

 

2.8 Charging & Discharging Do 2.8.1a&b, 2.8.2 a, 2.8.3a & b, 2.8.5a & b

Other fun stuff you should do:, Read 2.8.4,, 2.8.6, 2.9, & 2.10