F = k qq'/r E = kq/r

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PH 112 Electric field II
1/11/2005
Name_________________ Box___
F = k qq'/r2.
Coulomb's law says that the force magnitude between charges is
Electric field is force/charge. A charge q in an electric field E feels a force
E = kq/r2 ( point charge).
Thus from a point charge q we have an electric field magnitude
+3 C
y
x
10 m
-2 C
8m
5m
6m
p
3m
4m
Calculate the x and y components of the total electric field
at point p ( calculate Ex and Ey )due to the two point charges shown.
Draw arrows and label them. Find individual magnitudes.
Find components due to each charge. Add components to get
total.
F = qE.
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