Electric Force and Electric Field

fiftysixpowersΗλεκτρονική - Συσκευές

18 Οκτ 2013 (πριν από 3 χρόνια και 8 μήνες)

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Name:

__________________



2003
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GreetingLine
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Electric Force and Electric Field


Given the following charge configurations draw the forces on each charge due to each of
the other charges. Make the arrows appropriate lengths compared to each other.



1)






2)







3)








4)










Now you need to use a program called EM Field to begin to get a picture of how the
Electric field looks at various points in space. You will need to use the older computers
on the desk because EM field is not on the newer laptops. Answer the quest
ions on the
top of the next page and then use EM field as directed.

a
f

q

a
f

2q

a
f

q

a
f

q

a
f

q

a
f

-
3q

a
f

q

a
f

-
q

a
f

-
q

a
f

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a
f

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a
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-
q

Name:

__________________



2003
«
GreetingLine
»
, all rights reserved


Page
2

of
3

1)

Given below is a point charge fixed in space. If a second positive point charge is
placed at the points indicated with a dot draw what the force arrow would be for
that charge
if

it were

placed at that point.















2)

Now repeat the procedure for the following charge.












3)

How would you pictures for 1 and 2 change if the point charge value were
tripled? Explain.







4)

Now open EM field and create the situation as shown in 1.

You will need to turn
on the grid and remember only one point charge is actually in the situation. When
you click the mouse a various point on the screen an arrow is shown. These
arrows indicate the Electric Field at these points in space. Click the m
ouse button
at the points indicated in 1. Draw the results on 1 using dashed lines. Repeat the
procedure for 2 and then answer the question on the next page.





a
f

q

a
f

-
q

Name:

__________________



2003
«
GreetingLine
»
, all rights reserved


Page
3

of
3


a)

Are there similarities between you force arrows you drew and the Electric
field vectors dra
wn by the EM field? Explain.






b)

Remember that in EM Field there is no other charges than the one you put
there. Thus, based on your activities so far today what is an Electric
Field?







c)

Can you create a general rule for the direction of the electric

field?
Explain your rule.






d)

Now in EM field switch from field vectors to field lines (Dwain can show
you how). Repeat 1 and 2 for field lines. What observations do you have
for field lines? Explain them below.







e)

Now create your own charge distr
ibutions. You should create at least two
different situations with at least two charges in each. Use field lines to get
a feel for what the electric field looks like in space. Sketch you results on
the back of this page or print out your results.