Electrostatics Handout

 

D.) Conservation of Charge – net __________ of closed system ____________

 

ex.  If 2 charges are brought together their combined charge is ___________

 

Before contact-
 

 

After contact -

 

        *** Total ___________ = total ____________ after

 

E)  Elementary Charge - ____________________________________________

      Charges come in ____________ of ___________________ Coulombs

 

Proton      +1.6 X 10-19 C :  Ref. Electron       - _____________  C : Ref.

 

How many _____________________ are there in an object with a charge of  -9.6 X 10–19 C ?

 

 

 

Coulombs Law – Calculating the forces between two fixed point charges        

 

 

F -  __________ force of attraction or repulsion

       

(Newtons)  F = _______________

                        

q - ______________of each object

                                                         

r  - __________________ between objects       

                               

(On ______________________) k- electrostatic constant =  _______________

                                                                                                                    

 

 

F=[kq1q2]/(r2)

Ex) What is the electrical force between 2 very small objects located .5m apart when the charge on one object is 4X10–8 C and the charge on the second object is 6X10 -5 C  ?

 

 

 

 

 

Relationships-  F/r __________________ F/q __________________

 

Two charges attract each other with a force of F.  If one charged was doubled and the other charged was tripled, how would that change the attractive force between these charges?

 

 

 

G.) Electric Field - region in space where electric forces act on charges

 

1)  vector quantity - _______________________________

2)  E  = ______

                       

E = __________________________________

                       

q = amount of ____________________used to test field (C)

                       

F = ________________on charge in that field (N)