
Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Question
Use the rules described on page 314 to sketch the electric field lines in the region surrounding a-1C charge and a +2 C charge, separated by a short distance, as shown. Be sure to indicate the direction of the electric field lines [hint : rule # 2 on page 314 means that you will have more field lines leaving the +2C charge than you have entering the -1C charge. ]

Transcribed Image Text:final step is to put a small arrow on the line lU Il
tric field at that point). We can then do this again, starting at a new point in th.
generate another electric field line. If we do this from enough different st
l in enough diferent directions, we can get a sample of lines throughout the reoi
wn in Figure 16.11
This sounds like a complicated process-and it is. The good news is that we
rn a good deal through qualitative (non-numerical) sketches of electric field lines, with
ving to do any calculations. Your choice of the number of lines to draw is arbitrar
ce a choice is made, the following rules should be obeyed:
the region, as
can often
Out
1. Electric field lines never cross
2. Electric field lines begin on positive charges and end on negative charges. If the re
you are considering contains more positive than negative charges, some lines will
leave the region, and never return. If the region contains more negative charge, some
lines will come in from outside the region.
3. The lines entering or leaving a point charge are distributed evenly around the charge
One thing that is perhaps a little surprising about the sketches of electric field lines that
re produced following these rules and the procedure of Figure 16.10 is that the relative
rength of the electric field at each point in space turns out to be strictly proportional to how
ensely packed the lines are in the region around that point. To see what this means, consider
he 3-dimensional picture shown in Figure 16.12. Here, we follow four diverging field lines as
hey first intersect the small circular surface A, and then the larger circular surface A,. The
ize of each surface is chosen to just catch these four lines and no more. It then turns out that
he electric field in the region near each of the surfaces is exactly proportional to the density
of field lines intersecting the surface. Once we have decided how many field lines to draw to
epresent the field due to a particular charge, the proportionality may be writtern
Eo number of field lines crossing a surface
16.7)
area of the surface
Equation 16.7 says only that the electric field is proportional to this density of
e numerical value of the electric field directly from the field lines
In fact, the number of feld lines we drew was our own arbitrary choice. Nevertheless.t
ld
ketches are useful for understanding a lot of qualitative things about the elect
the future, we just need to remember that: first, the ele
ric
ctric field at
ngent to the
field line passing through that point; second, the strength of the electric field is prop
or
tional to the density of electric field lines, as in Equation 16.7; and third, for a poil
at
th
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I am having a hard time understanding why the solved answer on your site, for the following question, uses x-2 instead of x+2 for the -2q charge. I attached my work for part A as well as where I am confused at. Aren't I just supposed to solve for x at this point? The - seems to be throwing me off. Any explanation you can offer would be appreciated!
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